11516591 has 4 divisors (see below), whose sum is σ = 11571384. Its totient is φ = 11461800.

The previous prime is 11516581. The next prime is 11516663. The reversal of 11516591 is 19561511.

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 11516591 - 2¹⁸ = 11254447 is a prime.

It is a super-2 number, since 2×11516591² = 265263736522562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11516521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27080 + ... + 27501.

It is an arithmetic number, because the mean of its divisors is an integer number (2892846).

Almost surely, 2^11516591 is an apocalyptic number.

11516591 is a deficient number, since it is larger than the sum of its proper divisors (54793).

11516591 is an equidigital number, since it uses as much as digits as its factorization.

11516591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54792.

The product of its digits is 1350, while the sum is 29.

The square root of 11516591 is about 3393.6103194091. The cubic root of 11516591 is about 225.8263670126.

The spelling of 11516591 in words is "eleven million, five hundred sixteen thousand, five hundred ninety-one".