11213431 has 4 divisors (see below), whose sum is σ = 11220264. Its totient is φ = 11206600.

The previous prime is 11213417. The next prime is 11213453. The reversal of 11213431 is 13431211.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 13431211 = 743 ⋅18077.

It is a cyclic number.

It is not a de Polignac number, because 11213431 - 2⁵ = 11213399 is a prime.

It is a super-2 number, since 2×11213431² = 251482069583522, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11213471) 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, 696 + ... + 4786.

It is an arithmetic number, because the mean of its divisors is an integer number (2805066).

Almost surely, 2^11213431 is an apocalyptic number.

11213431 is a deficient number, since it is larger than the sum of its proper divisors (6833).

11213431 is an equidigital number, since it uses as much as digits as its factorization.

11213431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6832.

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

The square root of 11213431 is about 3348.6461443395. The cubic root of 11213431 is about 223.8271878756.

Adding to 11213431 its reverse (13431211), we get a palindrome (24644642).

It can be divided in two parts, 1121 and 3431, that multiplied together give a triangular number (3846151 = T₂₇₇₃).

The spelling of 11213431 in words is "eleven million, two hundred thirteen thousand, four hundred thirty-one".