31331311023131 has 16 divisors (see below), whose sum is σ = 36063551907840. Its totient is φ = 26663344495200.

The previous prime is 31331311023113. The next prime is 31331311023137. The reversal of 31331311023131 is 13132011313313.

It is not a de Polignac number, because 31331311023131 - 2¹⁸ = 31331310760987 is a prime.

It is a super-2 number, since 2×31331311023131² (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 31331311023131.

It is not an unprimeable number, because it can be changed into a prime (31331311023137) 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, 5912051 + ... + 9880028.

It is an arithmetic number, because the mean of its divisors is an integer number (2253971994240).

Almost surely, 2^{31331311023131} is an apocalyptic number.

31331311023131 is a deficient number, since it is larger than the sum of its proper divisors (4732240884709).

31331311023131 is a wasteful number, since it uses less digits than its factorization.

31331311023131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15794114.

The product of its (nonzero) digits is 1458, while the sum is 26.

Adding to 31331311023131 its reverse (13132011313313), we get a palindrome (44463322336444).

The spelling of 31331311023131 in words is "thirty-one trillion, three hundred thirty-one billion, three hundred eleven million, twenty-three thousand, one hundred thirty-one".