159019961 has 4 divisors (see below), whose sum is σ = 159045924. Its totient is φ = 158994000.

The previous prime is 159019951. The next prime is 159019967. The reversal of 159019961 is 169910951.

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 71503936 + 87516025 = 8456^2 + 9355^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-159019961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159019967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1871 + ... + 17931.

It is an arithmetic number, because the mean of its divisors is an integer number (39761481).

Almost surely, 2^159019961 is an apocalyptic number.

It is an amenable number.

159019961 is a deficient number, since it is larger than the sum of its proper divisors (25963).

159019961 is an equidigital number, since it uses as much as digits as its factorization.

159019961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25962.

The product of its (nonzero) digits is 21870, while the sum is 41.

The square root of 159019961 is about 12610.3116932136. The cubic root of 159019961 is about 541.7728211461.

The spelling of 159019961 in words is "one hundred fifty-nine million, nineteen thousand, nine hundred sixty-one".