999999255 has 16 divisors (see below), whose sum is σ = 1600391520. Its totient is φ = 533202048.

The previous prime is 999999229. The next prime is 999999323. The reversal of 999999255 is 552999999.

It is not a de Polignac number, because 999999255 - 2⁵ = 999999223 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110689 + ... + 119381.

It is an arithmetic number, because the mean of its divisors is an integer number (100024470).

Almost surely, 2^999999255 is an apocalyptic number.

999999255 is a deficient number, since it is larger than the sum of its proper divisors (600392265).

999999255 is a wasteful number, since it uses less digits than its factorization.

999999255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16370.

The product of its digits is 26572050, while the sum is 66.

The square root of 999999255 is about 31622.7648221973. The cubic root of 999999255 is about 999.9997516666. Note that the first 3 decimals are identical.

The spelling of 999999255 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, two hundred fifty-five".