159919921 has 8 divisors (see below), whose sum is σ = 186214464. Its totient is φ = 134487600.

The previous prime is 159919909. The next prime is 159919927. The reversal of 159919921 is 129919951.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 159919921 - 2⁵ = 159919889 is a prime.

It is a super-2 number, since 2×159919921² = 51148762265292482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159919927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215155 + ... + 215896.

It is an arithmetic number, because the mean of its divisors is an integer number (23276808).

Almost surely, 2^159919921 is an apocalyptic number.

It is an amenable number.

159919921 is a deficient number, since it is larger than the sum of its proper divisors (26294543).

159919921 is an equidigital number, since it uses as much as digits as its factorization.

159919921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431111.

The product of its digits is 65610, while the sum is 46.

The square root of 159919921 is about 12645.9448440992. The cubic root of 159919921 is about 542.7929382681.

The spelling of 159919921 in words is "one hundred fifty-nine million, nine hundred nineteen thousand, nine hundred twenty-one".