2509860857 has 4 divisors (see below), whose sum is σ = 2868412416. Its totient is φ = 2151309300.

The previous prime is 2509860827. The next prime is 2509860877. The reversal of 2509860857 is 7580689052.

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 not a de Polignac number, because 2509860857 - 2⁸ = 2509860601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2509860827) 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, 179275769 + ... + 179275782.

It is an arithmetic number, because the mean of its divisors is an integer number (717103104).

Almost surely, 2^2509860857 is an apocalyptic number.

It is an amenable number.

2509860857 is a deficient number, since it is larger than the sum of its proper divisors (358551559).

2509860857 is an equidigital number, since it uses as much as digits as its factorization.

2509860857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358551558.

The product of its (nonzero) digits is 1209600, while the sum is 50.

The square root of 2509860857 is about 50098.5115247948. The cubic root of 2509860857 is about 1358.9908995513.

The spelling of 2509860857 in words is "two billion, five hundred nine million, eight hundred sixty thousand, eight hundred fifty-seven".