11939621 has 2 divisors, whose sum is σ = 11939622. Its totient is φ = 11939620.

The previous prime is 11939563. The next prime is 11939659. The reversal of 11939621 is 12693911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7230721 + 4708900 = 2689^2 + 2170^2 .

It is a cyclic number.

It is not a de Polignac number, because 11939621 - 2¹⁴ = 11923237 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11939021) 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, 5969810 + 5969811.

It is an arithmetic number, because the mean of its divisors is an integer number (5969811).

Almost surely, 2^11939621 is an apocalyptic number.

It is an amenable number.

11939621 is a deficient number, since it is larger than the sum of its proper divisors (1).

11939621 is an equidigital number, since it uses as much as digits as its factorization.

11939621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2916, while the sum is 32.

The square root of 11939621 is about 3455.3756669862. The cubic root of 11939621 is about 228.5582210188.

The spelling of 11939621 in words is "eleven million, nine hundred thirty-nine thousand, six hundred twenty-one".