3131220240 has 120 divisors (see below), whose sum is σ = 10905218688. Its totient is φ = 834986880.

The previous prime is 3131220233. The next prime is 3131220241. The reversal of 3131220240 is 420221313.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (3131220241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61096 + ... + 99975.

Almost surely, 2^3131220240 is an apocalyptic number.

3131220240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3131220240 is an abundant number, since it is smaller than the sum of its proper divisors (7773998448).

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

3131220240 is a wasteful number, since it uses less digits than its factorization.

3131220240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161099 (or 161081 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 3131220240 is about 55957.3072976175. The cubic root of 3131220240 is about 1462.9782577872.

Adding to 3131220240 its reverse (420221313), we get a palindrome (3551441553).

The spelling of 3131220240 in words is "three billion, one hundred thirty-one million, two hundred twenty thousand, two hundred forty".