3131123303881 has 2 divisors, whose sum is σ = 3131123303882. Its totient is φ = 3131123303880.

The previous prime is 3131123303797. The next prime is 3131123304007. The reversal of 3131123303881 is 1883033211313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2923788788281 + 207334515600 = 1709909^2 + 455340^2 .

It is a cyclic number.

It is not a de Polignac number, because 3131123303881 - 2⁹ = 3131123303369 is a prime.

It is a super-2 number, since 2×3131123303881² (a number of 26 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 3131123303881.

It is not a weakly prime, because it can be changed into another prime (3131123303081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1565561651940 + 1565561651941.

It is an arithmetic number, because the mean of its divisors is an integer number (1565561651941).

Almost surely, 2^{3131123303881} is an apocalyptic number.

It is an amenable number.

3131123303881 is a deficient number, since it is larger than the sum of its proper divisors (1).

3131123303881 is an equidigital number, since it uses as much as digits as its factorization.

3131123303881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 37.

The spelling of 3131123303881 in words is "three trillion, one hundred thirty-one billion, one hundred twenty-three million, three hundred three thousand, eight hundred eighty-one".