13613591 has 2 divisors, whose sum is σ = 13613592. Its totient is φ = 13613590.

The previous prime is 13613581. The next prime is 13613609. The reversal of 13613591 is 19531631.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13613591 - 2¹⁰ = 13612567 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13613531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6806795 + 6806796.

It is an arithmetic number, because the mean of its divisors is an integer number (6806796).

Almost surely, 2^13613591 is an apocalyptic number.

13613591 is a deficient number, since it is larger than the sum of its proper divisors (1).

13613591 is an equidigital number, since it uses as much as digits as its factorization.

13613591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2430, while the sum is 29.

The square root of 13613591 is about 3689.6600114374. The cubic root of 13613591 is about 238.7761248059.

The spelling of 13613591 in words is "thirteen million, six hundred thirteen thousand, five hundred ninety-one".