131781612865277 has 2 divisors, whose sum is σ = 131781612865278. Its totient is φ = 131781612865276.

The previous prime is 131781612865223. The next prime is 131781612865297. The reversal of 131781612865277 is 772568216187131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90211795044121 + 41569817821156 = 9497989^2 + 6447466^2 .

It is a cyclic number.

It is not a de Polignac number, because 131781612865277 - 2³⁶ = 131712893388541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131781612865297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65890806432638 + 65890806432639.

It is an arithmetic number, because the mean of its divisors is an integer number (65890806432639).

Almost surely, 2^{131781612865277} is an apocalyptic number.

It is an amenable number.

131781612865277 is a deficient number, since it is larger than the sum of its proper divisors (1).

131781612865277 is an equidigital number, since it uses as much as digits as its factorization.

131781612865277 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47416320, while the sum is 65.

The spelling of 131781612865277 in words is "one hundred thirty-one trillion, seven hundred eighty-one billion, six hundred twelve million, eight hundred sixty-five thousand, two hundred seventy-seven".