990819457 has 2 divisors, whose sum is σ = 990819458. Its totient is φ = 990819456.

The previous prime is 990819451. The next prime is 990819469. The reversal of 990819457 is 754918099.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 613255696 + 377563761 = 24764^2 + 19431^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990819457 is a prime.

It is a super-3 number, since 3×990819457³ (a number of 28 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (990819451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495409728 + 495409729.

It is an arithmetic number, because the mean of its divisors is an integer number (495409729).

Almost surely, 2^990819457 is an apocalyptic number.

It is an amenable number.

990819457 is a deficient number, since it is larger than the sum of its proper divisors (1).

990819457 is an equidigital number, since it uses as much as digits as its factorization.

990819457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 816480, while the sum is 52.

The square root of 990819457 is about 31477.2847780745. The cubic root of 990819457 is about 996.9304062351.

The spelling of 990819457 in words is "nine hundred ninety million, eight hundred nineteen thousand, four hundred fifty-seven".