2551865 has 8 divisors (see below), whose sum is σ = 3127680. Its totient is φ = 1997872.

The previous prime is 2551859. The next prime is 2551867. The reversal of 2551865 is 5681552.

2551865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2551865 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2551867) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5195 + ... + 5664.

It is an arithmetic number, because the mean of its divisors is an integer number (390960).

2^2551865 is an apocalyptic number.

It is an amenable number.

2551865 is a deficient number, since it is larger than the sum of its proper divisors (575815).

2551865 is a wasteful number, since it uses less digits than its factorization.

2551865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10911.

The product of its digits is 12000, while the sum is 32.

The square root of 2551865 is about 1597.4557896856. The cubic root of 2551865 is about 136.6530193260.

The spelling of 2551865 in words is "two million, five hundred fifty-one thousand, eight hundred sixty-five".