2531313220 has 24 divisors (see below), whose sum is σ = 5316835608. Its totient is φ = 1012320000.

The previous prime is 2531313217. The next prime is 2531313287. The reversal of 2531313220 is 223131352.

It can be written as a sum of positive squares in 4 ways, for example, as 384473664 + 2146839556 = 19608^2 + 46334^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2531313191 and 2531313200.

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 7 ways as a sum of consecutive naturals, for example, 123720 + ... + 142720.

It is an arithmetic number, because the mean of its divisors is an integer number (221534817).

Almost surely, 2^2531313220 is an apocalyptic number.

2531313220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2531313220 is an abundant number, since it is smaller than the sum of its proper divisors (2785522388).

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

2531313220 is a wasteful number, since it uses less digits than its factorization.

2531313220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25671 (or 25669 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 2531313220 is about 50312.1577752336. The cubic root of 2531313220 is about 1362.8517905409.

Adding to 2531313220 its reverse (223131352), we get a palindrome (2754444572).

The spelling of 2531313220 in words is "two billion, five hundred thirty-one million, three hundred thirteen thousand, two hundred twenty".