231431013 has 72 divisors (see below), whose sum is σ = 404337024. Its totient is φ = 131725440.

The previous prime is 231431003. The next prime is 231431021. The reversal of 231431013 is 310134132.

231431013 is a `hidden beast` number, since 231 + 431 + 0 + 1 + 3 = 666.

It is not a de Polignac number, because 231431013 - 2¹² = 231426917 is a prime.

It is a super-3 number, since 3×231431013³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231431003) 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 71 ways as a sum of consecutive naturals, for example, 499620 + ... + 500082.

It is an arithmetic number, because the mean of its divisors is an integer number (5615792).

Almost surely, 2^231431013 is an apocalyptic number.

It is an amenable number.

231431013 is a deficient number, since it is larger than the sum of its proper divisors (172906011).

231431013 is a wasteful number, since it uses less digits than its factorization.

231431013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517 (or 494 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 231431013 is about 15212.8568322981. The cubic root of 231431013 is about 613.9606239360.

Adding to 231431013 its reverse (310134132), we get a palindrome (541565145).

The spelling of 231431013 in words is "two hundred thirty-one million, four hundred thirty-one thousand, thirteen".