11331431 has 4 divisors (see below), whose sum is σ = 11722200. Its totient is φ = 10940664.

The previous prime is 11331389. The next prime is 11331473. The reversal of 11331431 is 13413311.

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

It is an interprime number because it is at equal distance from previous prime (11331389) and next prime (11331473).

It is a cyclic number.

It is not a de Polignac number, because 11331431 - 2¹⁸ = 11069287 is a prime.

It is a super-2 number, since 2×11331431² = 256802657015522, 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 (11331491) 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, 195341 + ... + 195398.

It is an arithmetic number, because the mean of its divisors is an integer number (2930550).

Almost surely, 2^11331431 is an apocalyptic number.

11331431 is a deficient number, since it is larger than the sum of its proper divisors (390769).

11331431 is an equidigital number, since it uses as much as digits as its factorization.

11331431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390768.

The product of its digits is 108, while the sum is 17.

The square root of 11331431 is about 3366.2190956621. The cubic root of 11331431 is about 224.6095681615.

Adding to 11331431 its reverse (13413311), we get a palindrome (24744742).

The spelling of 11331431 in words is "eleven million, three hundred thirty-one thousand, four hundred thirty-one".