11512891 has 4 divisors (see below), whose sum is σ = 12398512. Its totient is φ = 10627272.

The previous prime is 11512861. The next prime is 11512901. The reversal of 11512891 is 19821511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19821511 = 1861 ⋅10651.

It is a cyclic number.

It is not a de Polignac number, because 11512891 - 2¹¹ = 11510843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11512861) 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, 442791 + ... + 442816.

It is an arithmetic number, because the mean of its divisors is an integer number (3099628).

Almost surely, 2^11512891 is an apocalyptic number.

11512891 is a deficient number, since it is larger than the sum of its proper divisors (885621).

11512891 is an equidigital number, since it uses as much as digits as its factorization.

11512891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885620.

The product of its digits is 720, while the sum is 28.

The square root of 11512891 is about 3393.0651334745. The cubic root of 11512891 is about 225.8021802530.

It can be divided in two parts, 11512 and 891, that added together give a triangular number (12403 = T₁₅₇).

The spelling of 11512891 in words is "eleven million, five hundred twelve thousand, eight hundred ninety-one".