990239491 has 2 divisors, whose sum is σ = 990239492. Its totient is φ = 990239490.

The previous prime is 990239441. The next prime is 990239519. The reversal of 990239491 is 194932099.

990239491 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 (194932099) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 990239491 - 2²⁹ = 453368579 is a prime.

It is not a weakly prime, because it can be changed into another prime (990239441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495119745 + 495119746.

It is an arithmetic number, because the mean of its divisors is an integer number (495119746).

Almost surely, 2^990239491 is an apocalyptic number.

990239491 is a deficient number, since it is larger than the sum of its proper divisors (1).

990239491 is an equidigital number, since it uses as much as digits as its factorization.

990239491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 157464, while the sum is 46.

The square root of 990239491 is about 31468.0709767853. The cubic root of 990239491 is about 996.7358539433.

The spelling of 990239491 in words is "nine hundred ninety million, two hundred thirty-nine thousand, four hundred ninety-one".