160904221 has 4 divisors (see below), whose sum is σ = 161064700. Its totient is φ = 160743744.

The previous prime is 160904207. The next prime is 160904311. The reversal of 160904221 is 122409061.

160904221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 60684100 + 100220121 = 7790^2 + 10011^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-160904221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (160902221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78726 + ... + 80743.

It is an arithmetic number, because the mean of its divisors is an integer number (40266175).

Almost surely, 2^160904221 is an apocalyptic number.

It is an amenable number.

160904221 is a deficient number, since it is larger than the sum of its proper divisors (160479).

160904221 is a wasteful number, since it uses less digits than its factorization.

160904221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160478.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 160904221 is about 12684.8027576309. The cubic root of 160904221 is about 543.9042834138.

The spelling of 160904221 in words is "one hundred sixty million, nine hundred four thousand, two hundred twenty-one".