11431231 has 4 divisors (see below), whose sum is σ = 13064272. Its totient is φ = 9798192.

The previous prime is 11431223. The next prime is 11431241. The reversal of 11431231 is 13213411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13213411 = 839 ⋅15749.

It is a cyclic number.

It is not a de Polignac number, because 11431231 - 2³ = 11431223 is a prime.

It is a super-2 number, since 2×11431231² = 261346084350722, 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 (11431241) 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, 816510 + ... + 816523.

It is an arithmetic number, because the mean of its divisors is an integer number (3266068).

Almost surely, 2^11431231 is an apocalyptic number.

11431231 is a deficient number, since it is larger than the sum of its proper divisors (1633041).

11431231 is an equidigital number, since it uses as much as digits as its factorization.

11431231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1633040.

The product of its digits is 72, while the sum is 16.

The square root of 11431231 is about 3381.0103519510. The cubic root of 11431231 is about 225.2670475308.

Adding to 11431231 its reverse (13213411), we get a palindrome (24644642).

The spelling of 11431231 in words is "eleven million, four hundred thirty-one thousand, two hundred thirty-one".