11917691 has 4 divisors (see below), whose sum is σ = 11967384. Its totient is φ = 11868000.

The previous prime is 11917681. The next prime is 11917709. The reversal of 11917691 is 19671911.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11917691 - 2⁶ = 11917627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11917651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24485 + ... + 24966.

It is an arithmetic number, because the mean of its divisors is an integer number (2991846).

Almost surely, 2^11917691 is an apocalyptic number.

11917691 is a deficient number, since it is larger than the sum of its proper divisors (49693).

11917691 is an equidigital number, since it uses as much as digits as its factorization.

11917691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49692.

The product of its digits is 3402, while the sum is 35.

The square root of 11917691 is about 3452.2008921846. The cubic root of 11917691 is about 228.4182011171.

The spelling of 11917691 in words is "eleven million, nine hundred seventeen thousand, six hundred ninety-one".