3113521231 has 4 divisors (see below), whose sum is σ = 3113907192. Its totient is φ = 3113135272.

The previous prime is 3113521193. The next prime is 3113521237. The reversal of 3113521231 is 1321253113.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3113521231 is a prime.

It is a super-2 number, since 2×3113521231² = 19388028911775510722, 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 (3113521237) 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, 180616 + ... + 197101.

It is an arithmetic number, because the mean of its divisors is an integer number (778476798).

Almost surely, 2^3113521231 is an apocalyptic number.

3113521231 is a deficient number, since it is larger than the sum of its proper divisors (385961).

3113521231 is an equidigital number, since it uses as much as digits as its factorization.

3113521231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385960.

The product of its digits is 540, while the sum is 22.

The square root of 3113521231 is about 55798.9357514998. The cubic root of 3113521231 is about 1460.2165862147.

Adding to 3113521231 its reverse (1321253113), we get a palindrome (4434774344).

The spelling of 3113521231 in words is "three billion, one hundred thirteen million, five hundred twenty-one thousand, two hundred thirty-one".