3145431220 has 12 divisors (see below), whose sum is σ = 6605405604. Its totient is φ = 1258172480.

The previous prime is 3145431173. The next prime is 3145431221. The reversal of 3145431220 is 221345413.

It can be written as a sum of positive squares in 2 ways, for example, as 2227462416 + 917968804 = 47196^2 + 30298^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3145431221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78635761 + ... + 78635800.

It is an arithmetic number, because the mean of its divisors is an integer number (550450467).

Almost surely, 2^3145431220 is an apocalyptic number.

It is an amenable number.

3145431220 is an abundant number, since it is smaller than the sum of its proper divisors (3459974384).

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

3145431220 is a wasteful number, since it uses less digits than its factorization.

3145431220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157271570 (or 157271568 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 3145431220 is about 56084.1441050855. The cubic root of 3145431220 is about 1465.1881504204.

Adding to 3145431220 its reverse (221345413), we get a palindrome (3366776633).

The spelling of 3145431220 in words is "three billion, one hundred forty-five million, four hundred thirty-one thousand, two hundred twenty".