231311231031 has 16 divisors (see below), whose sum is σ = 308991751040. Its totient is φ = 153919228320.

The previous prime is 231311231029. The next prime is 231311231069. The reversal of 231311231031 is 130132113132.

It is a happy number.

It is not a de Polignac number, because 231311231031 - 2¹ = 231311231029 is a prime.

It is a super-2 number, since 2×231311231031² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231311230989 and 231311231007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231311271031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8534241 + ... + 8561301.

It is an arithmetic number, because the mean of its divisors is an integer number (19311984440).

Almost surely, 2^231311231031 is an apocalyptic number.

231311231031 is a deficient number, since it is larger than the sum of its proper divisors (77680520009).

231311231031 is a wasteful number, since it uses less digits than its factorization.

231311231031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32286.

The product of its (nonzero) digits is 324, while the sum is 21.

Adding to 231311231031 its reverse (130132113132), we get a palindrome (361443344163).

The spelling of 231311231031 in words is "two hundred thirty-one billion, three hundred eleven million, two hundred thirty-one thousand, thirty-one".