131131209977 has 2 divisors, whose sum is σ = 131131209978. Its totient is φ = 131131209976.

The previous prime is 131131209949. The next prime is 131131210061. The reversal of 131131209977 is 779902131131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69160584256 + 61970625721 = 262984^2 + 248939^2 .

It is a cyclic number.

It is not a de Polignac number, because 131131209977 - 2¹⁸ = 131130947833 is a prime.

It is not a weakly prime, because it can be changed into another prime (131131208977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65565604988 + 65565604989.

It is an arithmetic number, because the mean of its divisors is an integer number (65565604989).

Almost surely, 2^131131209977 is an apocalyptic number.

It is an amenable number.

131131209977 is a deficient number, since it is larger than the sum of its proper divisors (1).

131131209977 is an equidigital number, since it uses as much as digits as its factorization.

131131209977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 71442, while the sum is 44.

The spelling of 131131209977 in words is "one hundred thirty-one billion, one hundred thirty-one million, two hundred nine thousand, nine hundred seventy-seven".