131808613 has 2 divisors, whose sum is σ = 131808614. Its totient is φ = 131808612.

The previous prime is 131808553. The next prime is 131808623. The reversal of 131808613 is 316808131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130919364 + 889249 = 11442^2 + 943^2 .

It is an emirp because it is prime and its reverse (316808131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131808613 - 2¹³ = 131800421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131808623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65904306 + 65904307.

It is an arithmetic number, because the mean of its divisors is an integer number (65904307).

Almost surely, 2^131808613 is an apocalyptic number.

It is an amenable number.

131808613 is a deficient number, since it is larger than the sum of its proper divisors (1).

131808613 is an equidigital number, since it uses as much as digits as its factorization.

131808613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 131808613 is about 11480.7932217247. The cubic root of 131808613 is about 508.9181385586.

The spelling of 131808613 in words is "one hundred thirty-one million, eight hundred eight thousand, six hundred thirteen".