199814917 has 2 divisors, whose sum is σ = 199814918. Its totient is φ = 199814916.

The previous prime is 199814899. The next prime is 199814921. The reversal of 199814917 is 719418991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196028001 + 3786916 = 14001^2 + 1946^2 .

It is a cyclic number.

It is not a de Polignac number, because 199814917 - 2⁷ = 199814789 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199814977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99907458 + 99907459.

It is an arithmetic number, because the mean of its divisors is an integer number (99907459).

Almost surely, 2^199814917 is an apocalyptic number.

It is an amenable number.

199814917 is a deficient number, since it is larger than the sum of its proper divisors (1).

199814917 is an equidigital number, since it uses as much as digits as its factorization.

199814917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 49.

The square root of 199814917 is about 14135.5904369078. The cubic root of 199814917 is about 584.6230966421.

The spelling of 199814917 in words is "one hundred ninety-nine million, eight hundred fourteen thousand, nine hundred seventeen".