2551165 has 4 divisors (see below), whose sum is σ = 3061404. Its totient is φ = 2040928.

The previous prime is 2551127. The next prime is 2551169. The reversal of 2551165 is 5611552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1172889 + 1378276 = 1083^2 + 1174^2 .

It is a cyclic number.

It is not a de Polignac number, because 2551165 - 2¹⁹ = 2026877 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2551169) 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, 255112 + ... + 255121.

It is an arithmetic number, because the mean of its divisors is an integer number (765351).

2^2551165 is an apocalyptic number.

It is an amenable number.

2551165 is a deficient number, since it is larger than the sum of its proper divisors (510239).

2551165 is an equidigital number, since it uses as much as digits as its factorization.

2551165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510238.

The product of its digits is 1500, while the sum is 25.

The square root of 2551165 is about 1597.2366762631. The cubic root of 2551165 is about 136.6405231240.

The spelling of 2551165 in words is "two million, five hundred fifty-one thousand, one hundred sixty-five".