3131131020 has 48 divisors (see below), whose sum is σ = 8789770080. Its totient is φ = 832815616.

The previous prime is 3131131007. The next prime is 3131131039. The reversal of 3131131020 is 201311313.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43737 + ... + 90416.

It is an arithmetic number, because the mean of its divisors is an integer number (183120210).

Almost surely, 2^3131131020 is an apocalyptic number.

3131131020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3131131020 is an abundant number, since it is smaller than the sum of its proper divisors (5658639060).

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

3131131020 is a wasteful number, since it uses less digits than its factorization.

3131131020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134554 (or 134552 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 15.

The square root of 3131131020 is about 55956.5100770232. The cubic root of 3131131020 is about 1462.9643624418.

Adding to 3131131020 its reverse (201311313), we get a palindrome (3332442333).

The spelling of 3131131020 in words is "three billion, one hundred thirty-one million, one hundred thirty-one thousand, twenty".