13618861 has 4 divisors (see below), whose sum is σ = 13908672. Its totient is φ = 13329052.

The previous prime is 13618837. The next prime is 13618879. The reversal of 13618861 is 16881631.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13618861 - 2¹⁵ = 13586093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13618961) 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, 144835 + ... + 144928.

It is an arithmetic number, because the mean of its divisors is an integer number (3477168).

Almost surely, 2^13618861 is an apocalyptic number.

It is an amenable number.

13618861 is a deficient number, since it is larger than the sum of its proper divisors (289811).

13618861 is an equidigital number, since it uses as much as digits as its factorization.

13618861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289810.

The product of its digits is 6912, while the sum is 34.

The square root of 13618861 is about 3690.3741002776. The cubic root of 13618861 is about 238.8069319563.

The spelling of 13618861 in words is "thirteen million, six hundred eighteen thousand, eight hundred sixty-one".