159647321 has 2 divisors, whose sum is σ = 159647322. Its totient is φ = 159647320.

The previous prime is 159647311. The next prime is 159647351. The reversal of 159647321 is 123746951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159643225 + 4096 = 12635^2 + 64^2 .

It is an emirp because it is prime and its reverse (123746951) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 159647321 - 2¹⁰ = 159646297 is a prime.

It is not a weakly prime, because it can be changed into another prime (159647311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79823660 + 79823661.

It is an arithmetic number, because the mean of its divisors is an integer number (79823661).

Almost surely, 2^159647321 is an apocalyptic number.

It is an amenable number.

159647321 is a deficient number, since it is larger than the sum of its proper divisors (1).

159647321 is an equidigital number, since it uses as much as digits as its factorization.

159647321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 38.

The square root of 159647321 is about 12635.1620883944. The cubic root of 159647321 is about 542.4843473437.

The spelling of 159647321 in words is "one hundred fifty-nine million, six hundred forty-seven thousand, three hundred twenty-one".