159997571 has 4 divisors (see below), whose sum is σ = 162620544. Its totient is φ = 157374600.

The previous prime is 159997567. The next prime is 159997589. The reversal of 159997571 is 175799951.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 175799951 = 19 ⋅9252629.

It is a cyclic number.

It is not a de Polignac number, because 159997571 - 2² = 159997567 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159997511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1311395 + ... + 1311516.

It is an arithmetic number, because the mean of its divisors is an integer number (40655136).

Almost surely, 2^159997571 is an apocalyptic number.

159997571 is a deficient number, since it is larger than the sum of its proper divisors (2622973).

159997571 is an equidigital number, since it uses as much as digits as its factorization.

159997571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2622972.

The product of its digits is 893025, while the sum is 53.

The square root of 159997571 is about 12649.0146256537. The cubic root of 159997571 is about 542.8807760882.

The spelling of 159997571 in words is "one hundred fifty-nine million, nine hundred ninety-seven thousand, five hundred seventy-one".