159121937 has 8 divisors (see below), whose sum is σ = 172076520. Its totient is φ = 146269440.

The previous prime is 159121913. The next prime is 159121951. The reversal of 159121937 is 739121951.

It can be written as a sum of positive squares in 4 ways, for example, as 261121 + 158860816 = 511^2 + 12604^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 159121937 - 2¹⁴ = 159105553 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 159121937.

It is not an unprimeable number, because it can be changed into a prime (159121957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22262 + ... + 28527.

It is an arithmetic number, because the mean of its divisors is an integer number (21509565).

Almost surely, 2^159121937 is an apocalyptic number.

It is an amenable number.

159121937 is a deficient number, since it is larger than the sum of its proper divisors (12954583).

159121937 is a wasteful number, since it uses less digits than its factorization.

159121937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51043.

The product of its digits is 17010, while the sum is 38.

The square root of 159121937 is about 12614.3544028222. The cubic root of 159121937 is about 541.8886053938. Note that the first 3 decimals are identical.

The spelling of 159121937 in words is "one hundred fifty-nine million, one hundred twenty-one thousand, nine hundred thirty-seven".