131123231977 has 2 divisors, whose sum is σ = 131123231978. Its totient is φ = 131123231976.

The previous prime is 131123231957. The next prime is 131123232007. The reversal of 131123231977 is 779132321131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128204099136 + 2919132841 = 358056^2 + 54029^2 .

It is a cyclic number.

It is not a de Polignac number, because 131123231977 - 2⁷ = 131123231849 is a prime.

It is not a weakly prime, because it can be changed into another prime (131123231957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65561615988 + 65561615989.

It is an arithmetic number, because the mean of its divisors is an integer number (65561615989).

Almost surely, 2^131123231977 is an apocalyptic number.

It is an amenable number.

131123231977 is a deficient number, since it is larger than the sum of its proper divisors (1).

131123231977 is an equidigital number, since it uses as much as digits as its factorization.

131123231977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47628, while the sum is 40.

The spelling of 131123231977 in words is "one hundred thirty-one billion, one hundred twenty-three million, two hundred thirty-one thousand, nine hundred seventy-seven".