159902561 has 24 divisors (see below), whose sum is σ = 209551104. Its totient is φ = 119059200.

The previous prime is 159902521. The next prime is 159902563. The reversal of 159902561 is 165209951.

It is not a de Polignac number, because 159902561 - 2²⁶ = 92793697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (159902563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16136 + ... + 24086.

It is an arithmetic number, because the mean of its divisors is an integer number (8731296).

Almost surely, 2^159902561 is an apocalyptic number.

It is an amenable number.

159902561 is a deficient number, since it is larger than the sum of its proper divisors (49648543).

159902561 is a wasteful number, since it uses less digits than its factorization.

159902561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8001 (or 7988 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 38.

The square root of 159902561 is about 12645.2584394310. The cubic root of 159902561 is about 542.7732967160.

The spelling of 159902561 in words is "one hundred fifty-nine million, nine hundred two thousand, five hundred sixty-one".