159972973 has 4 divisors (see below), whose sum is σ = 160003548. Its totient is φ = 159942400.

The previous prime is 159972971. The next prime is 159972979. The reversal of 159972973 is 379279951.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 379279951 = 29 ⋅13078619.

It can be written as a sum of positive squares in 2 ways, for example, as 39917124 + 120055849 = 6318^2 + 10957^2 .

It is a cyclic number.

It is not a de Polignac number, because 159972973 - 2¹ = 159972971 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 159972973.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (159972971) 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, 5236 + ... + 18637.

It is an arithmetic number, because the mean of its divisors is an integer number (40000887).

Almost surely, 2^159972973 is an apocalyptic number.

It is an amenable number.

159972973 is a deficient number, since it is larger than the sum of its proper divisors (30575).

159972973 is an equidigital number, since it uses as much as digits as its factorization.

159972973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30574.

The product of its digits is 1071630, while the sum is 52.

The square root of 159972973 is about 12648.0422595752. The cubic root of 159972973 is about 542.8529538623.

The spelling of 159972973 in words is "one hundred fifty-nine million, nine hundred seventy-two thousand, nine hundred seventy-three".