11656613 has 4 divisors (see below), whose sum is σ = 11769888. Its totient is φ = 11543340.

The previous prime is 11656583. The next prime is 11656627. The reversal of 11656613 is 31665611.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31665611 = 17 ⋅1862683.

It is a cyclic number.

It is not a de Polignac number, because 11656613 - 2⁸ = 11656357 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 (11656663) 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, 56483 + ... + 56688.

It is an arithmetic number, because the mean of its divisors is an integer number (2942472).

Almost surely, 2^11656613 is an apocalyptic number.

It is an amenable number.

11656613 is a deficient number, since it is larger than the sum of its proper divisors (113275).

11656613 is a wasteful number, since it uses less digits than its factorization.

11656613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113274.

The product of its digits is 3240, while the sum is 29.

The square root of 11656613 is about 3414.1782320201. The cubic root of 11656613 is about 226.7379031670.

The spelling of 11656613 in words is "eleven million, six hundred fifty-six thousand, six hundred thirteen".