231213301331031 has 8 divisors (see below), whose sum is σ = 342538224194160. Its totient is φ = 154142200887336.

The previous prime is 231213301331027. The next prime is 231213301331041. The reversal of 231213301331031 is 130133103312132.

231213301331031 is a `hidden beast` number, since 2 + 3 + 1 + 2 + 1 + 330 + 13 + 310 + 3 + 1 = 666.

It is not a de Polignac number, because 231213301331031 - 2² = 231213301331027 is a prime.

It is a super-2 number, since 2×231213301331031² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 8563455604853 = 231213301331031 / (2 + 3 + 1 + 2 + 1 + 3 + 3 + 0 + 1 + 3 + 3 + 1 + 0 + 3 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 231213301330986 and 231213301331004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231213301331041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4281727802400 + ... + 4281727802453.

It is an arithmetic number, because the mean of its divisors is an integer number (42817278024270).

Almost surely, 2^{231213301331031} is an apocalyptic number.

231213301331031 is a deficient number, since it is larger than the sum of its proper divisors (111324922863129).

231213301331031 is an equidigital number, since it uses as much as digits as its factorization.

231213301331031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8563455604862 (or 8563455604856 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 27.

Adding to 231213301331031 its reverse (130133103312132), we get a palindrome (361346404643163).

The spelling of 231213301331031 in words is "two hundred thirty-one trillion, two hundred thirteen billion, three hundred one million, three hundred thirty-one thousand, thirty-one".