168630091 has 4 divisors (see below), whose sum is σ = 192720112. Its totient is φ = 144540072.

The previous prime is 168630071. The next prime is 168630101. The reversal of 168630091 is 190036861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 168630091 - 2⁷ = 168629963 is a prime.

It is a super-2 number, since 2×168630091² = 56872215181336562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168630001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12045000 + ... + 12045013.

It is an arithmetic number, because the mean of its divisors is an integer number (48180028).

Almost surely, 2^168630091 is an apocalyptic number.

168630091 is a deficient number, since it is larger than the sum of its proper divisors (24090021).

168630091 is an equidigital number, since it uses as much as digits as its factorization.

168630091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24090020.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 168630091 is about 12985.7649370378. The cubic root of 168630091 is about 552.4738053277.

The spelling of 168630091 in words is "one hundred sixty-eight million, six hundred thirty thousand, ninety-one".