999255321 has 27 divisors (see below), whose sum is σ = 1485210493. Its totient is φ = 647393280.

The previous prime is 999255307. The next prime is 999255331. The reversal of 999255321 is 123552999.

The square root of 999255321 is 31611.

It is a perfect power (a square), and thus also a powerful number.

999255321 is a `hidden beast` number, since 9 + 9 + 92 + 553 + 2 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 9272025 + 989983296 = 3045^2 + 31464^2 .

It is not a de Polignac number, because 999255321 - 2⁷ = 999255193 is a prime.

It is a super-2 number, since 2×999255321² = 1997022393093626082, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (999255331) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3888025 + ... + 3888281.

Almost surely, 2^999255321 is an apocalyptic number.

999255321 is the 31611-st square number.

999255321 is the 15806-th centered octagonal number.

It is an amenable number.

999255321 is a deficient number, since it is larger than the sum of its proper divisors (485955172).

999255321 is an equidigital number, since it uses as much as digits as its factorization.

999255321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602 (or 301 counting only the distinct ones).

The product of its digits is 218700, while the sum is 45.

The cubic root of 999255321 is about 999.7517120249.

The spelling of 999255321 in words is "nine hundred ninety-nine million, two hundred fifty-five thousand, three hundred twenty-one".