3131020240 has 20 divisors (see below), whose sum is σ = 7279622244. Its totient is φ = 1252408064.

The previous prime is 3131020213. The next prime is 3131020289. The reversal of 3131020240 is 420201313.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 387774864 + 2743245376 = 19692^2 + 52376^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19568797 + ... + 19568956.

Almost surely, 2^3131020240 is an apocalyptic number.

It is an amenable number.

3131020240 is an abundant number, since it is smaller than the sum of its proper divisors (4148602004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3131020240 is a wasteful number, since it uses less digits than its factorization.

3131020240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39137766 (or 39137760 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 3131020240 is about 55955.5201923814. The cubic root of 3131020240 is about 1462.9471089209.

Adding to 3131020240 its reverse (420201313), we get a palindrome (3551221553).

The spelling of 3131020240 in words is "three billion, one hundred thirty-one million, twenty thousand, two hundred forty".