159897109 has 4 divisors (see below), whose sum is σ = 159923116. Its totient is φ = 159871104.

The previous prime is 159897079. The next prime is 159897119. The reversal of 159897109 is 901798951.

It is a happy number.

159897109 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 6682225 + 153214884 = 2585^2 + 12378^2 .

It is a cyclic number.

It is not a de Polignac number, because 159897109 - 2⁵ = 159897077 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 (159897119) 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, 1957 + ... + 17989.

It is an arithmetic number, because the mean of its divisors is an integer number (39980779).

Almost surely, 2^159897109 is an apocalyptic number.

It is an amenable number.

159897109 is a deficient number, since it is larger than the sum of its proper divisors (26007).

159897109 is an equidigital number, since it uses as much as digits as its factorization.

159897109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26006.

The product of its (nonzero) digits is 204120, while the sum is 49.

The square root of 159897109 is about 12645.0428627190. The cubic root of 159897109 is about 542.7671278891.

The spelling of 159897109 in words is "one hundred fifty-nine million, eight hundred ninety-seven thousand, one hundred nine".