131312231 has 4 divisors (see below), whose sum is σ = 131335200. Its totient is φ = 131289264.

The previous prime is 131312227. The next prime is 131312243. The reversal of 131312231 is 132213131.

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 131312231 - 2² = 131312227 is a prime.

It is a super-2 number, since 2×131312231² = 34485804020394722, 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 (131312201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4610 + ... + 16848.

It is an arithmetic number, because the mean of its divisors is an integer number (32833800).

Almost surely, 2^131312231 is an apocalyptic number.

131312231 is a deficient number, since it is larger than the sum of its proper divisors (22969).

131312231 is a wasteful number, since it uses less digits than its factorization.

131312231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22968.

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

The square root of 131312231 is about 11459.1548990316. The cubic root of 131312231 is about 508.2784849060.

Adding to 131312231 its reverse (132213131), we get a palindrome (263525362).

The spelling of 131312231 in words is "one hundred thirty-one million, three hundred twelve thousand, two hundred thirty-one".