990648583 has 2 divisors, whose sum is σ = 990648584. Its totient is φ = 990648582.

The previous prime is 990648559. The next prime is 990648623. The reversal of 990648583 is 385846099.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 990648583 - 2⁵ = 990648551 is a prime.

It is a super-2 number, since 2×990648583² = 1962769229999815778, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 990648583.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990648523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495324291 + 495324292.

It is an arithmetic number, because the mean of its divisors is an integer number (495324292).

Almost surely, 2^990648583 is an apocalyptic number.

990648583 is a deficient number, since it is larger than the sum of its proper divisors (1).

990648583 is an equidigital number, since it uses as much as digits as its factorization.

990648583 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The square root of 990648583 is about 31474.5704180375. The cubic root of 990648583 is about 996.8730936478.

The spelling of 990648583 in words is "nine hundred ninety million, six hundred forty-eight thousand, five hundred eighty-three".