990099973 has 2 divisors, whose sum is σ = 990099974. Its totient is φ = 990099972.

The previous prime is 990099923. The next prime is 990099977. The reversal of 990099973 is 379990099.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 989605764 + 494209 = 31458^2 + 703^2 .

It is an emirp because it is prime and its reverse (379990099) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990099973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (990099977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495049986 + 495049987.

It is an arithmetic number, because the mean of its divisors is an integer number (495049987).

Almost surely, 2^990099973 is an apocalyptic number.

It is an amenable number.

990099973 is a deficient number, since it is larger than the sum of its proper divisors (1).

990099973 is an equidigital number, since it uses as much as digits as its factorization.

990099973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1240029, while the sum is 55.

The square root of 990099973 is about 31465.8540802566. The cubic root of 990099973 is about 996.6890406469.

The spelling of 990099973 in words is "nine hundred ninety million, ninety-nine thousand, nine hundred seventy-three".