11312131 has 4 divisors (see below), whose sum is σ = 11319264. Its totient is φ = 11305000.

The previous prime is 11312111. The next prime is 11312177. The reversal of 11312131 is 13121311.

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.

It is a cyclic number.

It is not a de Polignac number, because 11312131 - 2⁵ = 11312099 is a prime.

It is a super-2 number, since 2×11312131² = 255928615522322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11312111) 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, 6 + ... + 4756.

It is an arithmetic number, because the mean of its divisors is an integer number (2829816).

Almost surely, 2^11312131 is an apocalyptic number.

11312131 is a deficient number, since it is larger than the sum of its proper divisors (7133).

11312131 is an equidigital number, since it uses as much as digits as its factorization.

11312131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7132.

The product of its digits is 18, while the sum is 13.

The square root of 11312131 is about 3363.3511562131. The cubic root of 11312131 is about 224.4819753288.

Adding to 11312131 its reverse (13121311), we get a palindrome (24433442).

The spelling of 11312131 in words is "eleven million, three hundred twelve thousand, one hundred thirty-one".