159173217 has 54 divisors (see below), whose sum is σ = 274713894. Its totient is φ = 88542720.

The previous prime is 159173197. The next prime is 159173233. The reversal of 159173217 is 712371951.

159173217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 8767521 + 150405696 = 2961^2 + 12264^2 .

It is not a de Polignac number, because 159173217 - 2⁶ = 159173153 is a prime.

It is a super-2 number, since 2×159173217² = 50672226020258178, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (159171217) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 1640913 + ... + 1641009.

Almost surely, 2^159173217 is an apocalyptic number.

It is an amenable number.

159173217 is a deficient number, since it is larger than the sum of its proper divisors (115540677).

159173217 is an equidigital number, since it uses as much as digits as its factorization.

159173217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239 (or 168 counting only the distinct ones).

The product of its digits is 13230, while the sum is 36.

The square root of 159173217 is about 12616.3868441008. The cubic root of 159173217 is about 541.9468103648.

The spelling of 159173217 in words is "one hundred fifty-nine million, one hundred seventy-three thousand, two hundred seventeen".