159555961 has 4 divisors (see below), whose sum is σ = 161105152. Its totient is φ = 158006772.

The previous prime is 159555959. The next prime is 159555971. The reversal of 159555961 is 169555951.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 159555961 - 2¹ = 159555959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159555911) 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, 774441 + ... + 774646.

It is an arithmetic number, because the mean of its divisors is an integer number (40276288).

Almost surely, 2^159555961 is an apocalyptic number.

It is an amenable number.

159555961 is a deficient number, since it is larger than the sum of its proper divisors (1549191).

159555961 is a wasteful number, since it uses less digits than its factorization.

159555961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1549190.

The product of its digits is 303750, while the sum is 46.

The square root of 159555961 is about 12631.5462632253. The cubic root of 159555961 is about 542.3808466467.

The spelling of 159555961 in words is "one hundred fifty-nine million, five hundred fifty-five thousand, nine hundred sixty-one".