3131021131 has 4 divisors (see below), whose sum is σ = 3578309872. Its totient is φ = 2683732392.

The previous prime is 3131021123. The next prime is 3131021143. The reversal of 3131021131 is 1311201313.

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 3131021131 - 2³ = 3131021123 is a prime.

It is a super-2 number, since 2×3131021131² = 19606586645537038322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3131021161) 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, 223644360 + ... + 223644373.

It is an arithmetic number, because the mean of its divisors is an integer number (894577468).

Almost surely, 2^3131021131 is an apocalyptic number.

3131021131 is a deficient number, since it is larger than the sum of its proper divisors (447288741).

3131021131 is an equidigital number, since it uses as much as digits as its factorization.

3131021131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447288740.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 3131021131 is about 55955.5281540618. The cubic root of 3131021131 is about 1462.9472476921.

Adding to 3131021131 its reverse (1311201313), we get a palindrome (4442222444).

It can be divided in two parts, 31310 and 21131, that added together give a square (52441 = 229²).

The spelling of 3131021131 in words is "three billion, one hundred thirty-one million, twenty-one thousand, one hundred thirty-one".