31321231122131 has 2 divisors, whose sum is σ = 31321231122132. Its totient is φ = 31321231122130.

The previous prime is 31321231122107. The next prime is 31321231122149. The reversal of 31321231122131 is 13122113212313.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31321231122131 is a prime.

It is a super-2 number, since 2×31321231122131² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31321231122131.

It is not a weakly prime, because it can be changed into another prime (31321231122161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15660615561065 + 15660615561066.

It is an arithmetic number, because the mean of its divisors is an integer number (15660615561066).

Almost surely, 2^{31321231122131} is an apocalyptic number.

31321231122131 is a deficient number, since it is larger than the sum of its proper divisors (1).

31321231122131 is an equidigital number, since it uses as much as digits as its factorization.

31321231122131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 26.

Adding to 31321231122131 its reverse (13122113212313), we get a palindrome (44443344334444).

The spelling of 31321231122131 in words is "thirty-one trillion, three hundred twenty-one billion, two hundred thirty-one million, one hundred twenty-two thousand, one hundred thirty-one".