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231403031 = 1758723189
BaseRepresentation
bin11011100101011…
…10111000010111
3121010102111021122
431302232320113
5433214344111
634543434155
75506615256
oct1562567027
9533374248
10231403031
11109691582
12655b595b
1338c30a92
1422a3879d
15154adcdb
hexdcaee17

231403031 has 8 divisors (see below), whose sum is σ = 245442960. Its totient is φ = 217410688.

The previous prime is 231403021. The next prime is 231403037. The reversal of 231403031 is 130304132.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2k-231403031 is a prime.

It is a super-2 number, since 2×2314030312 = 107094725511973922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231403037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1616 + ... + 21573.

It is an arithmetic number, because the mean of its divisors is an integer number (30680370).

Almost surely, 2231403031 is an apocalyptic number.

231403031 is a deficient number, since it is larger than the sum of its proper divisors (14039929).

231403031 is a wasteful number, since it uses less digits than its factorization.

231403031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23793.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 231403031 is about 15211.9371218790. The cubic root of 231403031 is about 613.9358785653.

Adding to 231403031 its reverse (130304132), we get a palindrome (361707163).

The spelling of 231403031 in words is "two hundred thirty-one million, four hundred three thousand, thirty-one".

Divisors: 1 17 587 9979 23189 394213 13611943 231403031