168391793 has 2 divisors, whose sum is σ = 168391794. Its totient is φ = 168391792.

The previous prime is 168391787. The next prime is 168391807. The reversal of 168391793 is 397193861.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113379904 + 55011889 = 10648^2 + 7417^2 .

It is a cyclic number.

It is not a de Polignac number, because 168391793 - 2²⁰ = 167343217 is a prime.

It is not a weakly prime, because it can be changed into another prime (168391753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84195896 + 84195897.

It is an arithmetic number, because the mean of its divisors is an integer number (84195897).

Almost surely, 2^168391793 is an apocalyptic number.

It is an amenable number.

168391793 is a deficient number, since it is larger than the sum of its proper divisors (1).

168391793 is an equidigital number, since it uses as much as digits as its factorization.

168391793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 47.

The square root of 168391793 is about 12976.5863384790. The cubic root of 168391793 is about 552.2134416213.

The spelling of 168391793 in words is "one hundred sixty-eight million, three hundred ninety-one thousand, seven hundred ninety-three".