231210031 has 16 divisors (see below), whose sum is σ = 262927840. Its totient is φ = 202113792.

The previous prime is 231210019. The next prime is 231210041. The reversal of 231210031 is 130012132.

It is not a de Polignac number, because 231210031 - 2¹⁹ = 230685743 is a prime.

It is a super-2 number, since 2×231210031² = 106916156870041922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231209993 and 231210020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231210041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87871 + ... + 90463.

It is an arithmetic number, because the mean of its divisors is an integer number (16432990).

Almost surely, 2^231210031 is an apocalyptic number.

231210031 is a deficient number, since it is larger than the sum of its proper divisors (31717809).

231210031 is an equidigital number, since it uses as much as digits as its factorization.

231210031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2663 (or 2625 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 231210031 is about 15205.5920963309. The cubic root of 231210031 is about 613.7651481861.

Adding to 231210031 its reverse (130012132), we get a palindrome (361222163).

The spelling of 231210031 in words is "two hundred thirty-one million, two hundred ten thousand, thirty-one".