11576991 has 4 divisors (see below), whose sum is σ = 15435992. Its totient is φ = 7717992.

The previous prime is 11576989. The next prime is 11577001. The reversal of 11576991 is 19967511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19967511 = 3 ⋅6655837.

It is not a de Polignac number, because 11576991 - 2¹ = 11576989 is a prime.

It is a super-2 number, since 2×11576991² = 268053441228162, 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 (11572991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1929496 + ... + 1929501.

It is an arithmetic number, because the mean of its divisors is an integer number (3858998).

Almost surely, 2^11576991 is an apocalyptic number.

11576991 is a deficient number, since it is larger than the sum of its proper divisors (3859001).

11576991 is an equidigital number, since it uses as much as digits as its factorization.

11576991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3859000.

The product of its digits is 17010, while the sum is 39.

The square root of 11576991 is about 3402.4977590000. The cubic root of 11576991 is about 226.2204690657.

The spelling of 11576991 in words is "eleven million, five hundred seventy-six thousand, nine hundred ninety-one".