168502091 has 2 divisors, whose sum is σ = 168502092. Its totient is φ = 168502090.

The previous prime is 168502063. The next prime is 168502111. The reversal of 168502091 is 190205861.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168502091 is a prime.

It is not a weakly prime, because it can be changed into another prime (168502891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84251045 + 84251046.

It is an arithmetic number, because the mean of its divisors is an integer number (84251046).

Almost surely, 2^168502091 is an apocalyptic number.

168502091 is a deficient number, since it is larger than the sum of its proper divisors (1).

168502091 is an equidigital number, since it uses as much as digits as its factorization.

168502091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 168502091 is about 12980.8355278079. The cubic root of 168502091 is about 552.3339834116. Note that the first 3 decimals are identical.

The spelling of 168502091 in words is "one hundred sixty-eight million, five hundred two thousand, ninety-one".