231323031 has 6 divisors (see below), whose sum is σ = 334133280. Its totient is φ = 154215348.

The previous prime is 231323021. The next prime is 231323069. The reversal of 231323031 is 130323132.

It is not a de Polignac number, because 231323031 - 2⁵ = 231322999 is a prime.

It is a super-2 number, since 2×231323031² = 107020689342053922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231322995 and 231323013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231323021) 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 5 ways as a sum of consecutive naturals, for example, 12851271 + ... + 12851288.

It is an arithmetic number, because the mean of its divisors is an integer number (55688880).

Almost surely, 2^231323031 is an apocalyptic number.

231323031 is a deficient number, since it is larger than the sum of its proper divisors (102810249).

231323031 is a wasteful number, since it uses less digits than its factorization.

231323031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25702565 (or 25702562 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

The square root of 231323031 is about 15209.3073806798. The cubic root of 231323031 is about 613.8651210200.

Adding to 231323031 its reverse (130323132), we get a palindrome (361646163).

The spelling of 231323031 in words is "two hundred thirty-one million, three hundred twenty-three thousand, thirty-one".