11917491 has 16 divisors (see below), whose sum is σ = 16261248. Its totient is φ = 7761600.

The previous prime is 11917487. The next prime is 11917501. The reversal of 11917491 is 19471911.

It is not a de Polignac number, because 11917491 - 2² = 11917487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11917481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42271 + ... + 42551.

It is an arithmetic number, because the mean of its divisors is an integer number (1016328).

Almost surely, 2^11917491 is an apocalyptic number.

11917491 is a deficient number, since it is larger than the sum of its proper divisors (4343757).

11917491 is a wasteful number, since it uses less digits than its factorization.

11917491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562.

The product of its digits is 2268, while the sum is 33.

The square root of 11917491 is about 3452.1719250350. The cubic root of 11917491 is about 228.4169233557.

The spelling of 11917491 in words is "eleven million, nine hundred seventeen thousand, four hundred ninety-one".