990568493 has 2 divisors, whose sum is σ = 990568494. Its totient is φ = 990568492.

The previous prime is 990568489. The next prime is 990568507. The reversal of 990568493 is 394865099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 771617284 + 218951209 = 27778^2 + 14797^2 .

It is a cyclic number.

It is not a de Polignac number, because 990568493 - 2² = 990568489 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990568433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495284246 + 495284247.

It is an arithmetic number, because the mean of its divisors is an integer number (495284247).

Almost surely, 2^990568493 is an apocalyptic number.

It is an amenable number.

990568493 is a deficient number, since it is larger than the sum of its proper divisors (1).

990568493 is an equidigital number, since it uses as much as digits as its factorization.

990568493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2099520, while the sum is 53.

The square root of 990568493 is about 31473.2980953697. The cubic root of 990568493 is about 996.8462285148.

The spelling of 990568493 in words is "nine hundred ninety million, five hundred sixty-eight thousand, four hundred ninety-three".