2551999 has 2 divisors, whose sum is σ = 2552000. Its totient is φ = 2551998.

The previous prime is 2551987. The next prime is 2552009. The reversal of 2551999 is 9991552.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2551999 - 2¹¹ = 2549951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2551979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1275999 + 1276000.

It is an arithmetic number, because the mean of its divisors is an integer number (1276000).

2^2551999 is an apocalyptic number.

2551999 is a deficient number, since it is larger than the sum of its proper divisors (1).

2551999 is an equidigital number, since it uses as much as digits as its factorization.

2551999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36450, while the sum is 40.

The square root of 2551999 is about 1597.4977308278. The cubic root of 2551999 is about 136.6554111955.

The spelling of 2551999 in words is "two million, five hundred fifty-one thousand, nine hundred ninety-nine".