2531318809 has 4 divisors (see below), whose sum is σ = 2585176704. Its totient is φ = 2477460916.

The previous prime is 2531318807. The next prime is 2531318813. The reversal of 2531318809 is 9088131352.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2531318809 - 2¹ = 2531318807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2531318807) 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, 26928877 + ... + 26928970.

It is an arithmetic number, because the mean of its divisors is an integer number (646294176).

Almost surely, 2^2531318809 is an apocalyptic number.

It is an amenable number.

2531318809 is a deficient number, since it is larger than the sum of its proper divisors (53857895).

2531318809 is an equidigital number, since it uses as much as digits as its factorization.

2531318809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53857894.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 2531318809 is about 50312.2133184379. The cubic root of 2531318809 is about 1362.8527935740.

The spelling of 2531318809 in words is "two billion, five hundred thirty-one million, three hundred eighteen thousand, eight hundred nine".