159217979 has 4 divisors (see below), whose sum is σ = 159281976. Its totient is φ = 159153984.

The previous prime is 159217969. The next prime is 159218011. The reversal of 159217979 is 979712951.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 159217979 - 2²⁴ = 142440763 is a prime.

It is a super-4 number, since 4×159217979⁴ (a number of 34 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159217969) 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, 28109 + ... + 33294.

It is an arithmetic number, because the mean of its divisors is an integer number (39820494).

Almost surely, 2^159217979 is an apocalyptic number.

159217979 is a deficient number, since it is larger than the sum of its proper divisors (63997).

159217979 is an equidigital number, since it uses as much as digits as its factorization.

159217979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63996.

The product of its digits is 357210, while the sum is 50.

The square root of 159217979 is about 12618.1606821280. The cubic root of 159217979 is about 541.9976069120.

The spelling of 159217979 in words is "one hundred fifty-nine million, two hundred seventeen thousand, nine hundred seventy-nine".