2551555 has 4 divisors (see below), whose sum is σ = 3061872. Its totient is φ = 2041240.

The previous prime is 2551543. The next prime is 2551559. The reversal of 2551555 is 5551552.

It is a happy number.

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

It is not a de Polignac number, because 2551555 - 2¹⁵ = 2518787 is a prime.

It is a Duffinian number.

2551555 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2551559) 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, 255151 + ... + 255160.

It is an arithmetic number, because the mean of its divisors is an integer number (765468).

2^2551555 is an apocalyptic number.

2551555 is a deficient number, since it is larger than the sum of its proper divisors (510317).

2551555 is an equidigital number, since it uses as much as digits as its factorization.

2551555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510316.

The product of its digits is 6250, while the sum is 28.

The square root of 2551555 is about 1597.3587574493. The cubic root of 2551555 is about 136.6474855756.

The spelling of 2551555 in words is "two million, five hundred fifty-one thousand, five hundred fifty-five".