159740521 has 2 divisors, whose sum is σ = 159740522. Its totient is φ = 159740520.

The previous prime is 159740519. The next prime is 159740527. The reversal of 159740521 is 125047951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124634896 + 35105625 = 11164^2 + 5925^2 .

It is a cyclic number.

It is not a de Polignac number, because 159740521 - 2¹ = 159740519 is a prime.

Together with 159740519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (159740527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79870260 + 79870261.

It is an arithmetic number, because the mean of its divisors is an integer number (79870261).

Almost surely, 2^159740521 is an apocalyptic number.

It is an amenable number.

159740521 is a deficient number, since it is larger than the sum of its proper divisors (1).

159740521 is an equidigital number, since it uses as much as digits as its factorization.

159740521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12600, while the sum is 34.

The square root of 159740521 is about 12638.8496707572. The cubic root of 159740521 is about 542.5898918764.

The spelling of 159740521 in words is "one hundred fifty-nine million, seven hundred forty thousand, five hundred twenty-one".