2531315225 has 18 divisors (see below), whose sum is σ = 3226000554. Its totient is φ = 1970294400.

The previous prime is 2531315221. The next prime is 2531315263. The reversal of 2531315225 is 5225131352.

It can be written as a sum of positive squares in 9 ways, for example, as 68773849 + 2462541376 = 8293^2 + 49624^2 .

It is not a de Polignac number, because 2531315225 - 2² = 2531315221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2531315221) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2756 + ... + 71205.

It is an arithmetic number, because the mean of its divisors is an integer number (179222253).

Almost surely, 2^2531315225 is an apocalyptic number.

2531315225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2531315225 is a deficient number, since it is larger than the sum of its proper divisors (694685329).

2531315225 is an equidigital number, since it uses as much as digits as its factorization.

2531315225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74045 (or 74003 counting only the distinct ones).

The product of its digits is 9000, while the sum is 29.

The square root of 2531315225 is about 50312.1777008310. The cubic root of 2531315225 is about 1362.8521503696.

Adding to 2531315225 its reverse (5225131352), we get a palindrome (7756446577).

The spelling of 2531315225 in words is "two billion, five hundred thirty-one million, three hundred fifteen thousand, two hundred twenty-five".