13613791 has 4 divisors (see below), whose sum is σ = 13643784. Its totient is φ = 13583800.

The previous prime is 13613783. The next prime is 13613801. The reversal of 13613791 is 19731631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19731631 = 23 ⋅857897.

It is a cyclic number.

It is not a de Polignac number, because 13613791 - 2³ = 13613783 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13613701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14305 + ... + 15226.

It is an arithmetic number, because the mean of its divisors is an integer number (3410946).

Almost surely, 2^13613791 is an apocalyptic number.

13613791 is a deficient number, since it is larger than the sum of its proper divisors (29993).

13613791 is an equidigital number, since it uses as much as digits as its factorization.

13613791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29992.

The product of its digits is 3402, while the sum is 31.

The square root of 13613791 is about 3689.6871141060. The cubic root of 13613791 is about 238.7772941028. Note that the first 3 decimals are identical.

The spelling of 13613791 in words is "thirteen million, six hundred thirteen thousand, seven hundred ninety-one".