131695591 has 2 divisors, whose sum is σ = 131695592. Its totient is φ = 131695590.

The previous prime is 131695579. The next prime is 131695601. The reversal of 131695591 is 195596131.

It is a strong prime.

It is an emirp because it is prime and its reverse (195596131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131695591 - 2⁵ = 131695559 is a prime.

It is equal to p_7468951 and since 131695591 and 7468951 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131693591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65847795 + 65847796.

It is an arithmetic number, because the mean of its divisors is an integer number (65847796).

Almost surely, 2^131695591 is an apocalyptic number.

131695591 is a deficient number, since it is larger than the sum of its proper divisors (1).

131695591 is an equidigital number, since it uses as much as digits as its factorization.

131695591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36450, while the sum is 40.

The square root of 131695591 is about 11475.8699452373. The cubic root of 131695591 is about 508.7726361956.

The spelling of 131695591 in words is "one hundred thirty-one million, six hundred ninety-five thousand, five hundred ninety-one".