2531131345 has 4 divisors (see below), whose sum is σ = 3037357620. Its totient is φ = 2024905072.

The previous prime is 2531131297. The next prime is 2531131387. The reversal of 2531131345 is 5431311352.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1146770496 + 1384360849 = 33864^2 + 37207^2 .

It is a cyclic number.

It is not a de Polignac number, because 2531131345 - 2²³ = 2522742737 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253113130 + ... + 253113139.

It is an arithmetic number, because the mean of its divisors is an integer number (759339405).

Almost surely, 2^2531131345 is an apocalyptic number.

It is an amenable number.

2531131345 is a deficient number, since it is larger than the sum of its proper divisors (506226275).

2531131345 is an equidigital number, since it uses as much as digits as its factorization.

2531131345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506226274.

The product of its digits is 5400, while the sum is 28.

The square root of 2531131345 is about 50310.3502770553. The cubic root of 2531131345 is about 1362.8191494327.

Adding to 2531131345 its reverse (5431311352), we get a palindrome (7962442697).

The spelling of 2531131345 in words is "two billion, five hundred thirty-one million, one hundred thirty-one thousand, three hundred forty-five".