3131912881 has 2 divisors, whose sum is σ = 3131912882. Its totient is φ = 3131912880.

The previous prime is 3131912809. The next prime is 3131912887. The reversal of 3131912881 is 1882191313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3093584400 + 38328481 = 55620^2 + 6191^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3131912881 is a prime.

It is a super-2 number, since 2×3131912881² = 19617756588347440322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3131912881.

It is not a weakly prime, because it can be changed into another prime (3131912887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1565956440 + 1565956441.

It is an arithmetic number, because the mean of its divisors is an integer number (1565956441).

Almost surely, 2^3131912881 is an apocalyptic number.

It is an amenable number.

3131912881 is a deficient number, since it is larger than the sum of its proper divisors (1).

3131912881 is an equidigital number, since it uses as much as digits as its factorization.

3131912881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 37.

The square root of 3131912881 is about 55963.4959683542. The cubic root of 3131912881 is about 1463.0861224468.

The spelling of 3131912881 in words is "three billion, one hundred thirty-one million, nine hundred twelve thousand, eight hundred eighty-one".