990990433 has 2 divisors, whose sum is σ = 990990434. Its totient is φ = 990990432.

The previous prime is 990990431. The next prime is 990990461. The reversal of 990990433 is 334099099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 509495184 + 481495249 = 22572^2 + 21943^2 .

It is a cyclic number.

It is not a de Polignac number, because 990990433 - 2¹ = 990990431 is a prime.

Together with 990990431, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (990990431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495495216 + 495495217.

It is an arithmetic number, because the mean of its divisors is an integer number (495495217).

Almost surely, 2^990990433 is an apocalyptic number.

It is an amenable number.

990990433 is a deficient number, since it is larger than the sum of its proper divisors (1).

990990433 is an equidigital number, since it uses as much as digits as its factorization.

990990433 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 236196, while the sum is 46.

The square root of 990990433 is about 31480.0005241423. Note that the first 3 decimals coincide. The cubic root of 990990433 is about 996.9877464392.

The spelling of 990990433 in words is "nine hundred ninety million, nine hundred ninety thousand, four hundred thirty-three".