159887521 has 4 divisors (see below), whose sum is σ = 161684100. Its totient is φ = 158090944.

The previous prime is 159887503. The next prime is 159887543. The reversal of 159887521 is 125788951.

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 99281296 + 60606225 = 9964^2 + 7785^2 .

It is a cyclic number.

It is not a de Polignac number, because 159887521 - 2¹⁹ = 159363233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159887501) 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, 898156 + ... + 898333.

It is an arithmetic number, because the mean of its divisors is an integer number (40421025).

Almost surely, 2^159887521 is an apocalyptic number.

It is an amenable number.

159887521 is a deficient number, since it is larger than the sum of its proper divisors (1796579).

159887521 is an equidigital number, since it uses as much as digits as its factorization.

159887521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1796578.

The product of its digits is 201600, while the sum is 46.

The square root of 159887521 is about 12644.6637361379. The cubic root of 159887521 is about 542.7562789224.

The spelling of 159887521 in words is "one hundred fifty-nine million, eight hundred eighty-seven thousand, five hundred twenty-one".