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231500000 = 2556463
BaseRepresentation
bin11011100110001…
…10100011100000
3121010121102022002
431303012203200
5433231000000
634545503132
75510501054
oct1563064340
9533542262
10231500000
11109748416
1265641aa8
1338c65c64
1422a61c64
15154cc8d5
hexdcc68e0

231500000 has 84 divisors (see below), whose sum is σ = 570930192. Its totient is φ = 92400000.

The previous prime is 231499969. The next prime is 231500023. The reversal of 231500000 is 5132.

231500000 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 499769 + ... + 500231.

It is an arithmetic number, because the mean of its divisors is an integer number (6796788).

Almost surely, 2231500000 is an apocalyptic number.

231500000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (285465096).

231500000 is an abundant number, since it is smaller than the sum of its proper divisors (339430192).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231500000 is an frugal number, since it uses more digits than its factorization.

231500000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503 (or 470 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 11.

The square root of 231500000 is about 15215.1240547029. The cubic root of 231500000 is about 614.0216228101.

Adding to 231500000 its reverse (5132), we get a palindrome (231505132).

The spelling of 231500000 in words is "two hundred thirty-one million, five hundred thousand".

Divisors: 1 2 4 5 8 10 16 20 25 32 40 50 80 100 125 160 200 250 400 463 500 625 800 926 1000 1250 1852 2000 2315 2500 3125 3704 4000 4630 5000 6250 7408 9260 10000 11575 12500 14816 15625 18520 20000 23150 25000 31250 37040 46300 50000 57875 62500 74080 92600 100000 115750 125000 185200 231500 250000 289375 370400 463000 500000 578750 926000 1157500 1446875 1852000 2315000 2893750 4630000 5787500 7234375 9260000 11575000 14468750 23150000 28937500 46300000 57875000 115750000 231500000