11659621 has 8 divisors (see below), whose sum is σ = 12058200. Its totient is φ = 11266560.

The previous prime is 11659573. The next prime is 11659631. The reversal of 11659621 is 12695611.

11659621 = 2414² + 2415².

It can be written as a sum of positive squares in 4 ways, for example, as 470596 + 11189025 = 686^2 + 3345^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11659621 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 (11659631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3165 + ... + 5773.

It is an arithmetic number, because the mean of its divisors is an integer number (1507275).

Almost surely, 2^11659621 is an apocalyptic number.

11659621 is the 2415-th centered square number.

It is an amenable number.

11659621 is a deficient number, since it is larger than the sum of its proper divisors (398579).

11659621 is a wasteful number, since it uses less digits than its factorization.

11659621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2759.

The product of its digits is 3240, while the sum is 31.

The square root of 11659621 is about 3414.6187195645. The cubic root of 11659621 is about 226.7574047997.

The spelling of 11659621 in words is "eleven million, six hundred fifty-nine thousand, six hundred twenty-one".