131518531913 has 2 divisors, whose sum is σ = 131518531914. Its totient is φ = 131518531912.

The previous prime is 131518531901. The next prime is 131518531951. The reversal of 131518531913 is 319135815131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92350955449 + 39167576464 = 303893^2 + 197908^2 .

It is a cyclic number.

It is not a de Polignac number, because 131518531913 - 2³⁰ = 130444790089 is a prime.

It is not a weakly prime, because it can be changed into another prime (131518531513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65759265956 + 65759265957.

It is an arithmetic number, because the mean of its divisors is an integer number (65759265957).

Almost surely, 2^131518531913 is an apocalyptic number.

It is an amenable number.

131518531913 is a deficient number, since it is larger than the sum of its proper divisors (1).

131518531913 is an equidigital number, since it uses as much as digits as its factorization.

131518531913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600, while the sum is 41.

The spelling of 131518531913 in words is "one hundred thirty-one billion, five hundred eighteen million, five hundred thirty-one thousand, nine hundred thirteen".