990002231 has 2 divisors, whose sum is σ = 990002232. Its totient is φ = 990002230.

The previous prime is 990002207. The next prime is 990002243. The reversal of 990002231 is 132200099.

990002231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (132200099) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990002231 is a prime.

It is a super-2 number, since 2×990002231² = 1960208834769954722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 990002231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990032231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495001115 + 495001116.

It is an arithmetic number, because the mean of its divisors is an integer number (495001116).

Almost surely, 2^990002231 is an apocalyptic number.

990002231 is a deficient number, since it is larger than the sum of its proper divisors (1).

990002231 is an equidigital number, since it uses as much as digits as its factorization.

990002231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 990002231 is about 31464.3008980018. The cubic root of 990002231 is about 996.6562420782.

The spelling of 990002231 in words is "nine hundred ninety million, two thousand, two hundred thirty-one".