11231391 has 4 divisors (see below), whose sum is σ = 14975192. Its totient is φ = 7487592.

The previous prime is 11231377. The next prime is 11231399. The reversal of 11231391 is 19313211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19313211 = 3 ⋅6437737.

It is not a de Polignac number, because 11231391 - 2⁵ = 11231359 is a prime.

It is a super-2 number, since 2×11231391² = 252288287589762, 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 (11231399) 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, 1871896 + ... + 1871901.

It is an arithmetic number, because the mean of its divisors is an integer number (3743798).

Almost surely, 2^11231391 is an apocalyptic number.

11231391 is a deficient number, since it is larger than the sum of its proper divisors (3743801).

11231391 is an equidigital number, since it uses as much as digits as its factorization.

11231391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3743800.

The product of its digits is 162, while the sum is 21.

The square root of 11231391 is about 3351.3267521983. The cubic root of 11231391 is about 223.9466217944.

The spelling of 11231391 in words is "eleven million, two hundred thirty-one thousand, three hundred ninety-one".