159169921 has 4 divisors (see below), whose sum is σ = 159736644. Its totient is φ = 158603200.

The previous prime is 159169891. The next prime is 159169939. The reversal of 159169921 is 129961951.

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 66259600 + 92910321 = 8140^2 + 9639^2 .

It is a cyclic number.

It is not a de Polignac number, because 159169921 - 2¹¹ = 159167873 is a prime.

It is a super-2 number, since 2×159169921² = 50670127502292482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159166921) 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, 282940 + ... + 283501.

It is an arithmetic number, because the mean of its divisors is an integer number (39934161).

Almost surely, 2^159169921 is an apocalyptic number.

It is an amenable number.

159169921 is a deficient number, since it is larger than the sum of its proper divisors (566723).

159169921 is an equidigital number, since it uses as much as digits as its factorization.

159169921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566722.

The product of its digits is 43740, while the sum is 43.

The square root of 159169921 is about 12616.2562196557. The cubic root of 159169921 is about 541.9430696412.

The spelling of 159169921 in words is "one hundred fifty-nine million, one hundred sixty-nine thousand, nine hundred twenty-one".