171970199 has 2 divisors, whose sum is σ = 171970200. Its totient is φ = 171970198.

The previous prime is 171970193. The next prime is 171970207. The reversal of 171970199 is 991079171.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171970199 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171970193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85985099 + 85985100.

It is an arithmetic number, because the mean of its divisors is an integer number (85985100).

Almost surely, 2^171970199 is an apocalyptic number.

171970199 is a deficient number, since it is larger than the sum of its proper divisors (1).

171970199 is an equidigital number, since it uses as much as digits as its factorization.

171970199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35721, while the sum is 44.

The square root of 171970199 is about 13113.7408469132. The cubic root of 171970199 is about 556.0976561468.

The spelling of 171970199 in words is "one hundred seventy-one million, nine hundred seventy thousand, one hundred ninety-nine".