159901121 has 4 divisors (see below), whose sum is σ = 161395632. Its totient is φ = 158406612.

The previous prime is 159901117. The next prime is 159901123. The reversal of 159901121 is 121109951.

159901121 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 121109951 = 653 ⋅185467.

It is a cyclic number.

It is not a de Polignac number, because 159901121 - 2² = 159901117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159901123) 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, 747095 + ... + 747308.

It is an arithmetic number, because the mean of its divisors is an integer number (40348908).

Almost surely, 2^159901121 is an apocalyptic number.

It is an amenable number.

159901121 is a deficient number, since it is larger than the sum of its proper divisors (1494511).

159901121 is a wasteful number, since it uses less digits than its factorization.

159901121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1494510.

The product of its (nonzero) digits is 810, while the sum is 29.

The square root of 159901121 is about 12645.2015009647. The cubic root of 159901121 is about 542.7716673989.

The spelling of 159901121 in words is "one hundred fifty-nine million, nine hundred one thousand, one hundred twenty-one".