3201131220 has 96 divisors (see below), whose sum is σ = 10520525568. Its totient is φ = 711908352.

The previous prime is 3201131179. The next prime is 3201131239. The reversal of 3201131220 is 221311023.

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

It is a self number, because there is not a number n which added to its sum of digits gives 3201131220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87457 + ... + 118536.

It is an arithmetic number, because the mean of its divisors is an integer number (109588808).

Almost surely, 2^3201131220 is an apocalyptic number.

3201131220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3201131220 is an abundant number, since it is smaller than the sum of its proper divisors (7319394348).

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

3201131220 is a wasteful number, since it uses less digits than its factorization.

3201131220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206049 (or 206047 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 3201131220 is about 56578.5402780948. The cubic root of 3201131220 is about 1473.7862227535.

Adding to 3201131220 its reverse (221311023), we get a palindrome (3422442243).

It can be divided in two parts, 3201 and 131220, that added together give a triangular number (134421 = T₅₁₈).

The spelling of 3201131220 in words is "three billion, two hundred one million, one hundred thirty-one thousand, two hundred twenty".