131333231 has 2 divisors, whose sum is σ = 131333232. Its totient is φ = 131333230.

The previous prime is 131333227. The next prime is 131333249. The reversal of 131333231 is 132333131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 131333231 - 2² = 131333227 is a prime.

It is a super-2 number, since 2×131333231² = 34496835129798722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131333201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65666615 + 65666616.

It is an arithmetic number, because the mean of its divisors is an integer number (65666616).

Almost surely, 2^131333231 is an apocalyptic number.

131333231 is a deficient number, since it is larger than the sum of its proper divisors (1).

131333231 is an equidigital number, since it uses as much as digits as its factorization.

131333231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 486, while the sum is 20.

The square root of 131333231 is about 11460.0711603375. The cubic root of 131333231 is about 508.3055788006.

Adding to 131333231 its reverse (132333131), we get a palindrome (263666362).

The spelling of 131333231 in words is "one hundred thirty-one million, three hundred thirty-three thousand, two hundred thirty-one".