999255577 has 4 divisors (see below), whose sum is σ = 1000077876. Its totient is φ = 998433280.

The previous prime is 999255557. The next prime is 999255583. The reversal of 999255577 is 775552999.

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 334853401 + 664402176 = 18299^2 + 25776^2 .

It is a cyclic number.

It is not a de Polignac number, because 999255577 - 2⁷ = 999255449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999255527) 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, 409324 + ... + 411757.

It is an arithmetic number, because the mean of its divisors is an integer number (250019469).

Almost surely, 2^999255577 is an apocalyptic number.

It is an amenable number.

999255577 is a deficient number, since it is larger than the sum of its proper divisors (822299).

999255577 is a wasteful number, since it uses less digits than its factorization.

999255577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822298.

The product of its digits is 8930250, while the sum is 58.

The square root of 999255577 is about 31611.0040492231. The cubic root of 999255577 is about 999.7517974006.

The spelling of 999255577 in words is "nine hundred ninety-nine million, two hundred fifty-five thousand, five hundred seventy-seven".