997794173 has 2 divisors, whose sum is σ = 997794174. Its totient is φ = 997794172.

The previous prime is 997794157. The next prime is 997794197. The reversal of 997794173 is 371497799.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 769119289 + 228674884 = 27733^2 + 15122^2 .

It is a cyclic number.

It is not a de Polignac number, because 997794173 - 2⁴ = 997794157 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997794103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498897086 + 498897087.

It is an arithmetic number, because the mean of its divisors is an integer number (498897087).

Almost surely, 2^997794173 is an apocalyptic number.

It is an amenable number.

997794173 is a deficient number, since it is larger than the sum of its proper divisors (1).

997794173 is an equidigital number, since it uses as much as digits as its factorization.

997794173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3000564, while the sum is 56.

The square root of 997794173 is about 31587.8801599601. The cubic root of 997794173 is about 999.2641830395.

The spelling of 997794173 in words is "nine hundred ninety-seven million, seven hundred ninety-four thousand, one hundred seventy-three".