11686621 has 2 divisors, whose sum is σ = 11686622. Its totient is φ = 11686620.

The previous prime is 11686603. The next prime is 11686637. The reversal of 11686621 is 12668611.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9765625 + 1920996 = 3125^2 + 1386^2 .

It is a cyclic number.

It is not a de Polignac number, because 11686621 - 2⁵ = 11686589 is a prime.

It is a super-2 number, since 2×11686621² = 273154220795282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11686601) 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 as a sum of consecutive naturals, namely, 5843310 + 5843311.

It is an arithmetic number, because the mean of its divisors is an integer number (5843311).

Almost surely, 2^11686621 is an apocalyptic number.

It is an amenable number.

11686621 is a deficient number, since it is larger than the sum of its proper divisors (1).

11686621 is an equidigital number, since it uses as much as digits as its factorization.

11686621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 31.

The square root of 11686621 is about 3418.5700226849. The cubic root of 11686621 is about 226.9323027120.

The spelling of 11686621 in words is "eleven million, six hundred eighty-six thousand, six hundred twenty-one".