990990799 has 2 divisors, whose sum is σ = 990990800. Its totient is φ = 990990798.

The previous prime is 990990761. The next prime is 990990821. The reversal of 990990799 is 997099099.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 990990799 - 2¹¹ = 990988751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990990709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495495399 + 495495400.

It is an arithmetic number, because the mean of its divisors is an integer number (495495400).

Almost surely, 2^990990799 is an apocalyptic number.

990990799 is a deficient number, since it is larger than the sum of its proper divisors (1).

990990799 is an equidigital number, since it uses as much as digits as its factorization.

990990799 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3720087, while the sum is 61.

The square root of 990990799 is about 31480.0063373564. The cubic root of 990990799 is about 996.9878691775.

The spelling of 990990799 in words is "nine hundred ninety million, nine hundred ninety thousand, seven hundred ninety-nine".