11431881 has 8 divisors (see below), whose sum is σ = 16936160. Its totient is φ = 7621236.

The previous prime is 11431879. The next prime is 11431883. The reversal of 11431881 is 18813411.

It is an interprime number because it is at equal distance from previous prime (11431879) and next prime (11431883).

It is not a de Polignac number, because 11431881 - 2¹ = 11431879 is a prime.

It is a super-2 number, since 2×11431881² = 261375806396322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 423403 = 11431881 / (1 + 1 + 4 + 3 + 1 + 8 + 8 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11431883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211675 + ... + 211728.

It is an arithmetic number, because the mean of its divisors is an integer number (2117020).

Almost surely, 2^11431881 is an apocalyptic number.

It is an amenable number.

11431881 is a deficient number, since it is larger than the sum of its proper divisors (5504279).

11431881 is an equidigital number, since it uses as much as digits as its factorization.

11431881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423412 (or 423406 counting only the distinct ones).

The product of its digits is 768, while the sum is 27.

The square root of 11431881 is about 3381.1064756970. The cubic root of 11431881 is about 225.2713171441.

The spelling of 11431881 in words is "eleven million, four hundred thirty-one thousand, eight hundred eighty-one".