159823997 has 4 divisors (see below), whose sum is σ = 159903900. Its totient is φ = 159744096.

The previous prime is 159823981. The next prime is 159824023. The reversal of 159823997 is 799328951.

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 50537881 + 109286116 = 7109^2 + 10454^2 .

It is a cyclic number.

It is not a de Polignac number, because 159823997 - 2⁴ = 159823981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159823907) 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, 36872 + ... + 40977.

It is an arithmetic number, because the mean of its divisors is an integer number (39975975).

Almost surely, 2^159823997 is an apocalyptic number.

It is an amenable number.

159823997 is a deficient number, since it is larger than the sum of its proper divisors (79903).

159823997 is an equidigital number, since it uses as much as digits as its factorization.

159823997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79902.

The product of its digits is 1224720, while the sum is 53.

The square root of 159823997 is about 12642.1515969395. The cubic root of 159823997 is about 542.6843895993.

The spelling of 159823997 in words is "one hundred fifty-nine million, eight hundred twenty-three thousand, nine hundred ninety-seven".