159625561 has 2 divisors, whose sum is σ = 159625562. Its totient is φ = 159625560.

The previous prime is 159625547. The next prime is 159625579. The reversal of 159625561 is 165526951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104939536 + 54686025 = 10244^2 + 7395^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-159625561 is a prime.

It is not a weakly prime, because it can be changed into another prime (159625261) 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, 79812780 + 79812781.

It is an arithmetic number, because the mean of its divisors is an integer number (79812781).

Almost surely, 2^159625561 is an apocalyptic number.

It is an amenable number.

159625561 is a deficient number, since it is larger than the sum of its proper divisors (1).

159625561 is an equidigital number, since it uses as much as digits as its factorization.

159625561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81000, while the sum is 40.

The square root of 159625561 is about 12634.3009699785. The cubic root of 159625561 is about 542.4596992722.

The spelling of 159625561 in words is "one hundred fifty-nine million, six hundred twenty-five thousand, five hundred sixty-one".