990463891 has 2 divisors, whose sum is σ = 990463892. Its totient is φ = 990463890.

The previous prime is 990463889. The next prime is 990463913. The reversal of 990463891 is 198364099.

990463891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 990463891 - 2¹ = 990463889 is a prime.

Together with 990463889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (990463861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495231945 + 495231946.

It is an arithmetic number, because the mean of its divisors is an integer number (495231946).

Almost surely, 2^990463891 is an apocalyptic number.

990463891 is a deficient number, since it is larger than the sum of its proper divisors (1).

990463891 is an equidigital number, since it uses as much as digits as its factorization.

990463891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 990463891 is about 31471.6362936534. The cubic root of 990463891 is about 996.8111389744.

The spelling of 990463891 in words is "nine hundred ninety million, four hundred sixty-three thousand, eight hundred ninety-one".