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231649 = 1121059
BaseRepresentation
bin111000100011100001
3102202202121
4320203201
524403044
64544241
71653235
oct704341
9382677
10231649
11149050
12b2081
1381592
14605c5
1548984
hex388e1

231649 has 4 divisors (see below), whose sum is σ = 252720. Its totient is φ = 210580.

The previous prime is 231643. The next prime is 231661. The reversal of 231649 is 946132.

231649 is nontrivially palindromic in base 15.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231649 - 211 = 229601 is a prime.

It is a super-2 number, since 2×2316492 = 107322518402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10519 + ... + 10540.

It is an arithmetic number, because the mean of its divisors is an integer number (63180).

2231649 is an apocalyptic number.

It is an amenable number.

231649 is a deficient number, since it is larger than the sum of its proper divisors (21071).

231649 is a wasteful number, since it uses less digits than its factorization.

231649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21070.

The product of its digits is 1296, while the sum is 25.

The square root of 231649 is about 481.2992831908. The cubic root of 231649 is about 61.4153328498.

The spelling of 231649 in words is "two hundred thirty-one thousand, six hundred forty-nine".

Divisors: 1 11 21059 231649