159731969 has 2 divisors, whose sum is σ = 159731970. Its totient is φ = 159731968.

The previous prime is 159731867. The next prime is 159731981. The reversal of 159731969 is 969137951.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150970369 + 8761600 = 12287^2 + 2960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-159731969 is a prime.

It is a super-2 number, since 2×159731969² = 51028603841233922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (159731069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79865984 + 79865985.

It is an arithmetic number, because the mean of its divisors is an integer number (79865985).

Almost surely, 2^159731969 is an apocalyptic number.

It is an amenable number.

159731969 is a deficient number, since it is larger than the sum of its proper divisors (1).

159731969 is an equidigital number, since it uses as much as digits as its factorization.

159731969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 459270, while the sum is 50.

The square root of 159731969 is about 12638.5113443000. The cubic root of 159731969 is about 542.5802088573.

The spelling of 159731969 in words is "one hundred fifty-nine million, seven hundred thirty-one thousand, nine hundred sixty-nine".