131231233 has 16 divisors (see below), whose sum is σ = 160859520. Its totient is φ = 104547456.

The previous prime is 131231213. The next prime is 131231237. The reversal of 131231233 is 332132131.

It is a cyclic number.

It is not a de Polignac number, because 131231233 - 2²¹ = 129134081 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131231233.

It is not an unprimeable number, because it can be changed into a prime (131231237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2260 + ... + 16357.

It is an arithmetic number, because the mean of its divisors is an integer number (10053720).

Almost surely, 2^131231233 is an apocalyptic number.

It is an amenable number.

131231233 is a deficient number, since it is larger than the sum of its proper divisors (29628287).

131231233 is a wasteful number, since it uses less digits than its factorization.

131231233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18696.

The product of its digits is 324, while the sum is 19.

The square root of 131231233 is about 11455.6201490797. The cubic root of 131231233 is about 508.1739553984.

Adding to 131231233 its reverse (332132131), we get a palindrome (463363364).

The spelling of 131231233 in words is "one hundred thirty-one million, two hundred thirty-one thousand, two hundred thirty-three".