131538909637 has 2 divisors, whose sum is σ = 131538909638. Its totient is φ = 131538909636.

The previous prime is 131538909599. The next prime is 131538909643. The reversal of 131538909637 is 736909835131.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124389530721 + 7149378916 = 352689^2 + 84554^2 .

It is a cyclic number.

It is not a de Polignac number, because 131538909637 - 2²³ = 131530521029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131538909037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65769454818 + 65769454819.

It is an arithmetic number, because the mean of its divisors is an integer number (65769454819).

Almost surely, 2^131538909637 is an apocalyptic number.

It is an amenable number.

131538909637 is a deficient number, since it is larger than the sum of its proper divisors (1).

131538909637 is an equidigital number, since it uses as much as digits as its factorization.

131538909637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3674160, while the sum is 55.

The spelling of 131538909637 in words is "one hundred thirty-one billion, five hundred thirty-eight million, nine hundred nine thousand, six hundred thirty-seven".