131231331 has 48 divisors (see below), whose sum is σ = 237419520. Its totient is φ = 67858560.

The previous prime is 131231323. The next prime is 131231363. The reversal of 131231331 is 133132131.

It is a happy number.

It is not a de Polignac number, because 131231331 - 2³ = 131231323 is a prime.

It is a super-2 number, since 2×131231331² = 34443324472063122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (131231371) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 283206 + ... + 283668.

It is an arithmetic number, because the mean of its divisors is an integer number (4946240).

Almost surely, 2^131231331 is an apocalyptic number.

131231331 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

131231331 is a deficient number, since it is larger than the sum of its proper divisors (106188189).

131231331 is a wasteful number, since it uses less digits than its factorization.

131231331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 896 (or 893 counting only the distinct ones).

The product of its digits is 162, while the sum is 18.

The square root of 131231331 is about 11455.6244264553. The cubic root of 131231331 is about 508.1740818953.

Adding to 131231331 its reverse (133132131), we get a palindrome (264363462).

The spelling of 131231331 in words is "one hundred thirty-one million, two hundred thirty-one thousand, three hundred thirty-one".