159391973 has 4 divisors (see below), whose sum is σ = 171652908. Its totient is φ = 147131040.

The previous prime is 159391957. The next prime is 159391979. The reversal of 159391973 is 379193951.

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 8421604 + 150970369 = 2902^2 + 12287^2 .

It is a cyclic number.

It is not a de Polignac number, because 159391973 - 2⁴ = 159391957 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 (159391979) 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, 6130448 + ... + 6130473.

It is an arithmetic number, because the mean of its divisors is an integer number (42913227).

Almost surely, 2^159391973 is an apocalyptic number.

159391973 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

159391973 is a deficient number, since it is larger than the sum of its proper divisors (12260935).

159391973 is a wasteful number, since it uses less digits than its factorization.

159391973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12260934.

The product of its digits is 229635, while the sum is 47.

The square root of 159391973 is about 12625.0533860257. The cubic root of 159391973 is about 542.1949673713.

The spelling of 159391973 in words is "one hundred fifty-nine million, three hundred ninety-one thousand, nine hundred seventy-three".