31331023123231 has 8 divisors (see below), whose sum is σ = 33744336045840. Its totient is φ = 28918172232192.

The previous prime is 31331023123193. The next prime is 31331023123237. The reversal of 31331023123231 is 13232132013313.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31331023123231 - 2³³ = 31322433188639 is a prime.

It is a super-2 number, since 2×31331023123231² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31331023123231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31331023123237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115367041 + ... + 115638298.

It is an arithmetic number, because the mean of its divisors is an integer number (4218042005730).

Almost surely, 2^{31331023123231} is an apocalyptic number.

31331023123231 is a deficient number, since it is larger than the sum of its proper divisors (2413312922609).

31331023123231 is a wasteful number, since it uses less digits than its factorization.

31331023123231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231015785.

The product of its (nonzero) digits is 5832, while the sum is 28.

Adding to 31331023123231 its reverse (13232132013313), we get a palindrome (44563155136544).

The spelling of 31331023123231 in words is "thirty-one trillion, three hundred thirty-one billion, twenty-three million, one hundred twenty-three thousand, two hundred thirty-one".