159743989 has 2 divisors, whose sum is σ = 159743990. Its totient is φ = 159743988.

The previous prime is 159743971. The next prime is 159743999. The reversal of 159743989 is 989347951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90155025 + 69588964 = 9495^2 + 8342^2 .

It is a cyclic number.

It is not a de Polignac number, because 159743989 - 2¹¹ = 159741941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (159743939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79871994 + 79871995.

It is an arithmetic number, because the mean of its divisors is an integer number (79871995).

Almost surely, 2^159743989 is an apocalyptic number.

It is an amenable number.

159743989 is a deficient number, since it is larger than the sum of its proper divisors (1).

159743989 is an equidigital number, since it uses as much as digits as its factorization.

159743989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 55.

The square root of 159743989 is about 12638.9868660427. The cubic root of 159743989 is about 542.5938184279.

The spelling of 159743989 in words is "one hundred fifty-nine million, seven hundred forty-three thousand, nine hundred eighty-nine".