172159897 has 16 divisors (see below), whose sum is σ = 213881472. Its totient is φ = 134933760.

The previous prime is 172159843. The next prime is 172159913. The reversal of 172159897 is 798951271.

172159897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 172159897 - 2²⁷ = 37942169 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172159897.

It is not an unprimeable number, because it can be changed into a prime (172159397) 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, 897 + ... + 18577.

It is an arithmetic number, because the mean of its divisors is an integer number (13367592).

Almost surely, 2^172159897 is an apocalyptic number.

It is an amenable number.

172159897 is a deficient number, since it is larger than the sum of its proper divisors (41721575).

172159897 is a wasteful number, since it uses less digits than its factorization.

172159897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17808.

The product of its digits is 317520, while the sum is 49.

The square root of 172159897 is about 13120.9716484718. The cubic root of 172159897 is about 556.3020556089.

It can be divided in two parts, 172159 and 897, that added together give a square (173056 = 416²).

The spelling of 172159897 in words is "one hundred seventy-two million, one hundred fifty-nine thousand, eight hundred ninety-seven".