990074171 has 2 divisors, whose sum is σ = 990074172. Its totient is φ = 990074170.

The previous prime is 990074159. The next prime is 990074177. The reversal of 990074171 is 171470099.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990074171 is a prime.

It is not a weakly prime, because it can be changed into another prime (990074177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495037085 + 495037086.

It is an arithmetic number, because the mean of its divisors is an integer number (495037086).

Almost surely, 2^990074171 is an apocalyptic number.

990074171 is a deficient number, since it is larger than the sum of its proper divisors (1).

990074171 is an equidigital number, since it uses as much as digits as its factorization.

990074171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 38.

The square root of 990074171 is about 31465.4440775909. Note that the first 3 decimals coincide. The cubic root of 990074171 is about 996.6803826680.

The spelling of 990074171 in words is "nine hundred ninety million, seventy-four thousand, one hundred seventy-one".