131306231 has 16 divisors (see below), whose sum is σ = 156878400. Its totient is φ = 109791360.

The previous prime is 131306209. The next prime is 131306233. The reversal of 131306231 is 132603131.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-131306231 is a prime.

It is a super-2 number, since 2×131306231² = 34482652598850722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131306233) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9395 + ... + 18731.

It is an arithmetic number, because the mean of its divisors is an integer number (9804900).

Almost surely, 2^131306231 is an apocalyptic number.

131306231 is a deficient number, since it is larger than the sum of its proper divisors (25572169).

131306231 is an frugal number, since it uses more digits than its factorization.

131306231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9399 (or 9385 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 131306231 is about 11458.8930966302. The cubic root of 131306231 is about 508.2707432627.

Adding to 131306231 its reverse (132603131), we get a palindrome (263909362).

The spelling of 131306231 in words is "one hundred thirty-one million, three hundred six thousand, two hundred thirty-one".