99905171 has 2 divisors, whose sum is σ = 99905172. Its totient is φ = 99905170.

The previous prime is 99905161. The next prime is 99905177. The reversal of 99905171 is 17150999.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (17150999) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99905171 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99905177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49952585 + 49952586.

It is an arithmetic number, because the mean of its divisors is an integer number (49952586).

Almost surely, 2^99905171 is an apocalyptic number.

99905171 is a deficient number, since it is larger than the sum of its proper divisors (1).

99905171 is an equidigital number, since it uses as much as digits as its factorization.

99905171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25515, while the sum is 41.

The square root of 99905171 is about 9995.2574253993. The cubic root of 99905171 is about 464.0121178836.

The spelling of 99905171 in words is "ninety-nine million, nine hundred five thousand, one hundred seventy-one".