160721081 has 8 divisors (see below), whose sum is σ = 170390784. Its totient is φ = 151331760.

The previous prime is 160721063. The next prime is 160721087. The reversal of 160721081 is 180127061.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 160721081 - 2⁶ = 160721017 is a prime.

It is a super-2 number, since 2×160721081² = 51662531755617122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 160721081.

It is not an unprimeable number, because it can be changed into a prime (160721087) 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 7 ways as a sum of consecutive naturals, for example, 68915 + ... + 71208.

It is an arithmetic number, because the mean of its divisors is an integer number (21298848).

Almost surely, 2^160721081 is an apocalyptic number.

It is an amenable number.

160721081 is a deficient number, since it is larger than the sum of its proper divisors (9669703).

160721081 is a wasteful number, since it uses less digits than its factorization.

160721081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140191.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 160721081 is about 12677.5818277777. The cubic root of 160721081 is about 543.6978491227.

The spelling of 160721081 in words is "one hundred sixty million, seven hundred twenty-one thousand, eighty-one".