159999997 has 2 divisors, whose sum is σ = 159999998. Its totient is φ = 159999996.

The previous prime is 159999949. The next prime is 160000003. The reversal of 159999997 is 799999951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82101721 + 77898276 = 9061^2 + 8826^2 .

It is an emirp because it is prime and its reverse (799999951) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 159999997 - 2¹⁹ = 159475709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (159999907) 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 as a sum of consecutive naturals, namely, 79999998 + 79999999.

It is an arithmetic number, because the mean of its divisors is an integer number (79999999).

Almost surely, 2^159999997 is an apocalyptic number.

It is an amenable number.

159999997 is a deficient number, since it is larger than the sum of its proper divisors (1).

159999997 is an equidigital number, since it uses as much as digits as its factorization.

159999997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18600435, while the sum is 67.

The square root of 159999997 is about 12649.1105220881. The cubic root of 159999997 is about 542.8835199260.

The spelling of 159999997 in words is "one hundred fifty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-seven".