168392081 has 16 divisors (see below), whose sum is σ = 198555840. Its totient is φ = 140790720.

The previous prime is 168392071. The next prime is 168392099. The reversal of 168392081 is 180293861.

It is a cyclic number.

It is not a de Polignac number, because 168392081 - 2⁶ = 168392017 is a prime.

It is a super-2 number, since 2×168392081² = 56711785887021122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168392071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39890 + ... + 43908.

It is an arithmetic number, because the mean of its divisors is an integer number (12409740).

Almost surely, 2^168392081 is an apocalyptic number.

168392081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

168392081 is a deficient number, since it is larger than the sum of its proper divisors (30163759).

168392081 is a wasteful number, since it uses less digits than its factorization.

168392081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4336.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 168392081 is about 12976.5974353834. The cubic root of 168392081 is about 552.2137564375.

The spelling of 168392081 in words is "one hundred sixty-eight million, three hundred ninety-two thousand, eighty-one".