11555391 has 4 divisors (see below), whose sum is σ = 15407192. Its totient is φ = 7703592.

The previous prime is 11555387. The next prime is 11555437. The reversal of 11555391 is 19355511.

11555391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 11555391 - 2² = 11555387 is a prime.

It is a super-2 number, since 2×11555391² = 267054122325762, 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 (11555371) 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, 1925896 + ... + 1925901.

It is an arithmetic number, because the mean of its divisors is an integer number (3851798).

Almost surely, 2^11555391 is an apocalyptic number.

11555391 is a deficient number, since it is larger than the sum of its proper divisors (3851801).

11555391 is an equidigital number, since it uses as much as digits as its factorization.

11555391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3851800.

The product of its digits is 3375, while the sum is 30.

The square root of 11555391 is about 3399.3221383093. The cubic root of 11555391 is about 226.0796897035.

The spelling of 11555391 in words is "eleven million, five hundred fifty-five thousand, three hundred ninety-one".