11613661 has 4 divisors (see below), whose sum is σ = 11620512. Its totient is φ = 11606812.

The previous prime is 11613649. The next prime is 11613677. The reversal of 11613661 is 16631611.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 11613661 - 2⁵ = 11613629 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 (11613631) 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, 1200 + ... + 4966.

It is an arithmetic number, because the mean of its divisors is an integer number (2905128).

Almost surely, 2^11613661 is an apocalyptic number.

It is an amenable number.

11613661 is a deficient number, since it is larger than the sum of its proper divisors (6851).

11613661 is an equidigital number, since it uses as much as digits as its factorization.

11613661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6850.

The product of its digits is 648, while the sum is 25.

The square root of 11613661 is about 3407.8821869308. The cubic root of 11613661 is about 226.4590676601.

The spelling of 11613661 in words is "eleven million, six hundred thirteen thousand, six hundred sixty-one".