9990492173 has 2 divisors, whose sum is σ = 9990492174. Its totient is φ = 9990492172.

The previous prime is 9990492157. The next prime is 9990492203. The reversal of 9990492173 is 3712940999.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9984406084 + 6086089 = 99922^2 + 2467^2 .

It is an emirp because it is prime and its reverse (3712940999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9990492173 - 2⁴ = 9990492157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9990492133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4995246086 + 4995246087.

It is an arithmetic number, because the mean of its divisors is an integer number (4995246087).

Almost surely, 2^9990492173 is an apocalyptic number.

It is an amenable number.

9990492173 is a deficient number, since it is larger than the sum of its proper divisors (1).

9990492173 is an equidigital number, since it uses as much as digits as its factorization.

9990492173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1102248, while the sum is 53.

The square root of 9990492173 is about 99952.4495597782. The cubic root of 9990492173 is about 2153.7516737756.

The spelling of 9990492173 in words is "nine billion, nine hundred ninety million, four hundred ninety-two thousand, one hundred seventy-three".