159491217 has 4 divisors (see below), whose sum is σ = 212654960. Its totient is φ = 106327476.

The previous prime is 159491209. The next prime is 159491237. The reversal of 159491217 is 712194951.

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.

It is not a de Polignac number, because 159491217 - 2³ = 159491209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159491207) 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, 26581867 + ... + 26581872.

It is an arithmetic number, because the mean of its divisors is an integer number (53163740).

Almost surely, 2^159491217 is an apocalyptic number.

It is an amenable number.

159491217 is a deficient number, since it is larger than the sum of its proper divisors (53163743).

159491217 is an equidigital number, since it uses as much as digits as its factorization.

159491217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53163742.

The product of its digits is 22680, while the sum is 39.

The square root of 159491217 is about 12628.9832132282. The cubic root of 159491217 is about 542.3074749884.

The spelling of 159491217 in words is "one hundred fifty-nine million, four hundred ninety-one thousand, two hundred seventeen".