999255331 has 2 divisors, whose sum is σ = 999255332. Its totient is φ = 999255330.

The previous prime is 999255307. The next prime is 999255373. The reversal of 999255331 is 133552999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 999255331 - 2¹⁵ = 999222563 is a prime.

It is a super-2 number, since 2×999255331² = 1997022433063839122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (999235331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499627665 + 499627666.

It is an arithmetic number, because the mean of its divisors is an integer number (499627666).

Almost surely, 2^999255331 is an apocalyptic number.

999255331 is a deficient number, since it is larger than the sum of its proper divisors (1).

999255331 is an equidigital number, since it uses as much as digits as its factorization.

999255331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 328050, while the sum is 46.

The square root of 999255331 is about 31611.0001581728. Note that the first 3 decimals coincide. The cubic root of 999255331 is about 999.7517153598.

The spelling of 999255331 in words is "nine hundred ninety-nine million, two hundred fifty-five thousand, three hundred thirty-one".