2555999 has 4 divisors (see below), whose sum is σ = 2562336. Its totient is φ = 2549664.

The previous prime is 2555989. The next prime is 2556011. The reversal of 2555999 is 9995552.

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

It is a cyclic number.

It is not a de Polignac number, because 2555999 - 2¹² = 2551903 is a prime.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2555989) 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, 2519 + ... + 3384.

It is an arithmetic number, because the mean of its divisors is an integer number (640584).

2^2555999 is an apocalyptic number.

2555999 is a deficient number, since it is larger than the sum of its proper divisors (6337).

2555999 is an equidigital number, since it uses as much as digits as its factorization.

2555999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6336.

The product of its digits is 182250, while the sum is 44.

The square root of 2555999 is about 1598.7491985924. The cubic root of 2555999 is about 136.7267717644.

The spelling of 2555999 in words is "two million, five hundred fifty-five thousand, nine hundred ninety-nine".