2501865 has 24 divisors (see below), whose sum is σ = 4422600. Its totient is φ = 1307904.

The previous prime is 2501843. The next prime is 2501881. The reversal of 2501865 is 5681052.

2501865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 974169 + 1527696 = 987^2 + 1236^2 .

It is not a de Polignac number, because 2501865 - 2⁵ = 2501833 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1861 + ... + 2909.

It is an arithmetic number, because the mean of its divisors is an integer number (184275).

2^2501865 is an apocalyptic number.

It is an amenable number.

2501865 is a deficient number, since it is larger than the sum of its proper divisors (1920735).

2501865 is a wasteful number, since it uses less digits than its factorization.

2501865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113 (or 1110 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

The square root of 2501865 is about 1581.7284849177. The cubic root of 2501865 is about 135.7546216999.

The spelling of 2501865 in words is "two million, five hundred one thousand, eight hundred sixty-five".