131031321 has 8 divisors (see below), whose sum is σ = 175984224. Its totient is φ = 86716320.

The previous prime is 131031301. The next prime is 131031337. The reversal of 131031321 is 123130131.

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

It is not a de Polignac number, because 131031321 - 2⁵ = 131031289 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 131031321.

It is not an unprimeable number, because it can be changed into a prime (131031301) 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, 158995 + ... + 159816.

It is an arithmetic number, because the mean of its divisors is an integer number (21998028).

Almost surely, 2^131031321 is an apocalyptic number.

It is an amenable number.

131031321 is a deficient number, since it is larger than the sum of its proper divisors (44952903).

131031321 is a wasteful number, since it uses less digits than its factorization.

131031321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318951.

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

The square root of 131031321 is about 11446.8913247222. The cubic root of 131031321 is about 507.9157808284.

Adding to 131031321 its reverse (123130131), we get a palindrome (254161452).

The spelling of 131031321 in words is "one hundred thirty-one million, thirty-one thousand, three hundred twenty-one".