990835291 has 2 divisors, whose sum is σ = 990835292. Its totient is φ = 990835290.

The previous prime is 990835289. The next prime is 990835319. The reversal of 990835291 is 192538099.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 990835291 - 2¹ = 990835289 is a prime.

Together with 990835289, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (990835201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495417645 + 495417646.

It is an arithmetic number, because the mean of its divisors is an integer number (495417646).

Almost surely, 2^990835291 is an apocalyptic number.

990835291 is a deficient number, since it is larger than the sum of its proper divisors (1).

990835291 is an equidigital number, since it uses as much as digits as its factorization.

990835291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 46.

The square root of 990835291 is about 31477.5362917748. The cubic root of 990835291 is about 996.9357167593.

The spelling of 990835291 in words is "nine hundred ninety million, eight hundred thirty-five thousand, two hundred ninety-one".