168721199 has 2 divisors, whose sum is σ = 168721200. Its totient is φ = 168721198.

The previous prime is 168721153. The next prime is 168721219. The reversal of 168721199 is 991127861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 168721199 - 2¹² = 168717103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168721139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84360599 + 84360600.

It is an arithmetic number, because the mean of its divisors is an integer number (84360600).

Almost surely, 2^168721199 is an apocalyptic number.

168721199 is a deficient number, since it is larger than the sum of its proper divisors (1).

168721199 is an equidigital number, since it uses as much as digits as its factorization.

168721199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 44.

The square root of 168721199 is about 12989.2724584559. The cubic root of 168721199 is about 552.5732848470.

The spelling of 168721199 in words is "one hundred sixty-eight million, seven hundred twenty-one thousand, one hundred ninety-nine".