131538909599 has 2 divisors, whose sum is σ = 131538909600. Its totient is φ = 131538909598.

The previous prime is 131538909559. The next prime is 131538909637. The reversal of 131538909599 is 995909835131.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131538909599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131538909539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65769454799 + 65769454800.

It is an arithmetic number, because the mean of its divisors is an integer number (65769454800).

Almost surely, 2^131538909599 is an apocalyptic number.

131538909599 is a deficient number, since it is larger than the sum of its proper divisors (1).

131538909599 is an equidigital number, since it uses as much as digits as its factorization.

131538909599 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11809800, while the sum is 62.

The spelling of 131538909599 in words is "one hundred thirty-one billion, five hundred thirty-eight million, nine hundred nine thousand, five hundred ninety-nine".