131557513 has 2 divisors, whose sum is σ = 131557514. Its totient is φ = 131557512.

The previous prime is 131557499. The next prime is 131557567. The reversal of 131557513 is 315755131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119530489 + 12027024 = 10933^2 + 3468^2 .

It is an emirp because it is prime and its reverse (315755131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131557513 - 2⁹ = 131557001 is a prime.

It is not a weakly prime, because it can be changed into another prime (131557313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65778756 + 65778757.

It is an arithmetic number, because the mean of its divisors is an integer number (65778757).

Almost surely, 2^131557513 is an apocalyptic number.

It is an amenable number.

131557513 is a deficient number, since it is larger than the sum of its proper divisors (1).

131557513 is an equidigital number, since it uses as much as digits as its factorization.

131557513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7875, while the sum is 31.

The square root of 131557513 is about 11469.8523530166. The cubic root of 131557513 is about 508.5947641968.

The spelling of 131557513 in words is "one hundred thirty-one million, five hundred fifty-seven thousand, five hundred thirteen".