11915091 has 6 divisors (see below), whose sum is σ = 17210700. Its totient is φ = 7943388.

The previous prime is 11915077. The next prime is 11915093. The reversal of 11915091 is 19051911.

It is not a de Polignac number, because 11915091 - 2⁷ = 11914963 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11915093) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 661941 + ... + 661958.

It is an arithmetic number, because the mean of its divisors is an integer number (2868450).

Almost surely, 2^11915091 is an apocalyptic number.

11915091 is a deficient number, since it is larger than the sum of its proper divisors (5295609).

11915091 is a wasteful number, since it uses less digits than its factorization.

11915091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1323905 (or 1323902 counting only the distinct ones).

The product of its (nonzero) digits is 405, while the sum is 27.

The square root of 11915091 is about 3451.8243002795. The cubic root of 11915091 is about 228.4015891040.

It can be divided in two parts, 11 and 915091, that multiplied together give a palindrome (10066001).

The spelling of 11915091 in words is "eleven million, nine hundred fifteen thousand, ninety-one".