131031231 has 8 divisors (see below), whose sum is σ = 174773760. Its totient is φ = 87321432.

The previous prime is 131031227. The next prime is 131031259. The reversal of 131031231 is 132130131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 131031231 - 2² = 131031227 is a prime.

It is a super-2 number, since 2×131031231² = 34338366994750722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 131031231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131031031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3576 + ... + 16578.

It is an arithmetic number, because the mean of its divisors is an integer number (21846720).

Almost surely, 2^131031231 is an apocalyptic number.

131031231 is a deficient number, since it is larger than the sum of its proper divisors (43742529).

131031231 is a wasteful number, since it uses less digits than its factorization.

131031231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16365.

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 131031231 is about 11446.8873935232. The cubic root of 131031231 is about 507.9156645395.

Adding to 131031231 its reverse (132130131), we get a palindrome (263161362).

The spelling of 131031231 in words is "one hundred thirty-one million, thirty-one thousand, two hundred thirty-one".