11611657 has 4 divisors (see below), whose sum is σ = 11758720. Its totient is φ = 11464596.

The previous prime is 11611637. The next prime is 11611669. The reversal of 11611657 is 75611611.

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: 75611611 = 79 ⋅957109.

It is a cyclic number.

It is not a de Polignac number, because 11611657 - 2⁷ = 11611529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11611627) 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, 73413 + ... + 73570.

It is an arithmetic number, because the mean of its divisors is an integer number (2939680).

Almost surely, 2^11611657 is an apocalyptic number.

It is an amenable number.

11611657 is a deficient number, since it is larger than the sum of its proper divisors (147063).

11611657 is an equidigital number, since it uses as much as digits as its factorization.

11611657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147062.

The product of its digits is 1260, while the sum is 28.

The square root of 11611657 is about 3407.5881499970. The cubic root of 11611657 is about 226.4460413320.

The spelling of 11611657 in words is "eleven million, six hundred eleven thousand, six hundred fifty-seven".