11911639 has 2 divisors, whose sum is σ = 11911640. Its totient is φ = 11911638.

The previous prime is 11911619. The next prime is 11911667. The reversal of 11911639 is 93611911.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11911639 - 2⁷ = 11911511 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11911639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11911619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5955819 + 5955820.

It is an arithmetic number, because the mean of its divisors is an integer number (5955820).

Almost surely, 2^11911639 is an apocalyptic number.

11911639 is a deficient number, since it is larger than the sum of its proper divisors (1).

11911639 is an equidigital number, since it uses as much as digits as its factorization.

11911639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1458, while the sum is 31.

The square root of 11911639 is about 3451.3242386076. The cubic root of 11911639 is about 228.3795297274.

The spelling of 11911639 in words is "eleven million, nine hundred eleven thousand, six hundred thirty-nine".