3131121040 has 40 divisors (see below), whose sum is σ = 7287767928. Its totient is φ = 1251087360.

The previous prime is 3131121011. The next prime is 3131121043. The reversal of 3131121040 is 401211313.

It can be written as a sum of positive squares in 4 ways, for example, as 145154304 + 2985966736 = 12048^2 + 54644^2 .

It is a tau number, because it is divible by the number of its divisors (40).

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

It is not an unprimeable number, because it can be changed into a prime (3131121043) 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, 54484 + ... + 96076.

Almost surely, 2^3131121040 is an apocalyptic number.

It is an amenable number.

3131121040 is an abundant number, since it is smaller than the sum of its proper divisors (4156646888).

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

3131121040 is a wasteful number, since it uses less digits than its factorization.

3131121040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42547 (or 42541 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 3131121040 is about 55956.4209005544. The cubic root of 3131121040 is about 1462.9628081153.

Adding to 3131121040 its reverse (401211313), we get a palindrome (3532332353).

The spelling of 3131121040 in words is "three billion, one hundred thirty-one million, one hundred twenty-one thousand, forty".