11691639 has 12 divisors (see below), whose sum is σ = 16917576. Its totient is φ = 7780752.

The previous prime is 11691587. The next prime is 11691643. The reversal of 11691639 is 93619611.

11691639 is a `hidden beast` number, since 1 + 16 + 9 + 1 + 639 = 666.

It is not a de Polignac number, because 11691639 - 2¹³ = 11683447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11691649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9472 + ... + 10634.

It is an arithmetic number, because the mean of its divisors is an integer number (1409798).

Almost surely, 2^11691639 is an apocalyptic number.

11691639 is a deficient number, since it is larger than the sum of its proper divisors (5225937).

11691639 is a wasteful number, since it uses less digits than its factorization.

11691639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2286 (or 2283 counting only the distinct ones).

The product of its digits is 8748, while the sum is 36.

The square root of 11691639 is about 3419.3038765222. The cubic root of 11691639 is about 226.9647781198.

The spelling of 11691639 in words is "eleven million, six hundred ninety-one thousand, six hundred thirty-nine".