3131020231 has 4 divisors (see below), whose sum is σ = 3137994000. Its totient is φ = 3124046464.

The previous prime is 3131020213. The next prime is 3131020289. The reversal of 3131020231 is 1320201313.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3131020231 - 2¹⁵ = 3130987463 is a prime.

It is a super-2 number, since 2×3131020231² = 19606575373862586722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3131020631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3486211 + ... + 3487108.

It is an arithmetic number, because the mean of its divisors is an integer number (784498500).

Almost surely, 2^3131020231 is an apocalyptic number.

3131020231 is a deficient number, since it is larger than the sum of its proper divisors (6973769).

3131020231 is an equidigital number, since it uses as much as digits as its factorization.

3131020231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6973768.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 3131020231 is about 55955.5201119604. The cubic root of 3131020231 is about 1462.9471075192.

Adding to 3131020231 its reverse (1320201313), we get a palindrome (4451221544).

The spelling of 3131020231 in words is "three billion, one hundred thirty-one million, twenty thousand, two hundred thirty-one".