99980171 has 2 divisors, whose sum is σ = 99980172. Its totient is φ = 99980170.

The previous prime is 99980137. The next prime is 99980173. The reversal of 99980171 is 17108999.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99980171 is a prime.

Together with 99980173, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (99980173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49990085 + 49990086.

It is an arithmetic number, because the mean of its divisors is an integer number (49990086).

Almost surely, 2^99980171 is an apocalyptic number.

99980171 is a deficient number, since it is larger than the sum of its proper divisors (1).

99980171 is an equidigital number, since it uses as much as digits as its factorization.

99980171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 44.

The square root of 99980171 is about 9999.0085008465. The cubic root of 99980171 is about 464.1282019783.

The spelling of 99980171 in words is "ninety-nine million, nine hundred eighty thousand, one hundred seventy-one".