2505859 has 2 divisors, whose sum is σ = 2505860. Its totient is φ = 2505858.

The previous prime is 2505857. The next prime is 2505863. The reversal of 2505859 is 9585052.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2505859 - 2¹ = 2505857 is a prime.

Together with 2505857, it forms a pair of twin primes.

2505859 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (2505857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1252929 + 1252930.

It is an arithmetic number, because the mean of its divisors is an integer number (1252930).

2^2505859 is an apocalyptic number.

2505859 is a deficient number, since it is larger than the sum of its proper divisors (1).

2505859 is an equidigital number, since it uses as much as digits as its factorization.

2505859 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18000, while the sum is 34.

The square root of 2505859 is about 1582.9905242925. The cubic root of 2505859 is about 135.8268232627.

It can be divided in two parts, 2505 and 859, that added together give a square (3364 = 58²).

The spelling of 2505859 in words is "two million, five hundred five thousand, eight hundred fifty-nine".