131813609 has 2 divisors, whose sum is σ = 131813610. Its totient is φ = 131813608.

The previous prime is 131813593. The next prime is 131813639. The reversal of 131813609 is 906318131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129163225 + 2650384 = 11365^2 + 1628^2 .

It is a cyclic number.

It is not a de Polignac number, because 131813609 - 2⁴ = 131813593 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (131813639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65906804 + 65906805.

It is an arithmetic number, because the mean of its divisors is an integer number (65906805).

Almost surely, 2^131813609 is an apocalyptic number.

It is an amenable number.

131813609 is a deficient number, since it is larger than the sum of its proper divisors (1).

131813609 is an equidigital number, since it uses as much as digits as its factorization.

131813609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 131813609 is about 11481.0108004478. The cubic root of 131813609 is about 508.9245683936.

The spelling of 131813609 in words is "one hundred thirty-one million, eight hundred thirteen thousand, six hundred nine".