131604399591 has 64 divisors (see below), whose sum is σ = 211879618560. Its totient is φ = 71034163200.

The previous prime is 131604399491. The next prime is 131604399611. The reversal of 131604399591 is 195993406131.

It is not a de Polignac number, because 131604399591 - 2⁹ = 131604399079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131604399191) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 46983391 + ... + 46986191.

It is an arithmetic number, because the mean of its divisors is an integer number (3310619040).

Almost surely, 2^131604399591 is an apocalyptic number.

131604399591 is a deficient number, since it is larger than the sum of its proper divisors (80275218969).

131604399591 is a wasteful number, since it uses less digits than its factorization.

131604399591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4016.

The product of its (nonzero) digits is 787320, while the sum is 51.

The spelling of 131604399591 in words is "one hundred thirty-one billion, six hundred four million, three hundred ninety-nine thousand, five hundred ninety-one".