131371883561 has 2 divisors, whose sum is σ = 131371883562. Its totient is φ = 131371883560.

The previous prime is 131371883557. The next prime is 131371883593. The reversal of 131371883561 is 165388173131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89606830336 + 41765053225 = 299344^2 + 204365^2 .

It is a cyclic number.

It is not a de Polignac number, because 131371883561 - 2² = 131371883557 is a prime.

It is not a weakly prime, because it can be changed into another prime (131371883261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65685941780 + 65685941781.

It is an arithmetic number, because the mean of its divisors is an integer number (65685941781).

Almost surely, 2^131371883561 is an apocalyptic number.

It is an amenable number.

131371883561 is a deficient number, since it is larger than the sum of its proper divisors (1).

131371883561 is an equidigital number, since it uses as much as digits as its factorization.

131371883561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 47.

The spelling of 131371883561 in words is "one hundred thirty-one billion, three hundred seventy-one million, eight hundred eighty-three thousand, five hundred sixty-one".