159728731 has 2 divisors, whose sum is σ = 159728732. Its totient is φ = 159728730.

The previous prime is 159728729. The next prime is 159728747. The reversal of 159728731 is 137827951.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 159728731 - 2¹ = 159728729 is a prime.

It is a super-2 number, since 2×159728731² = 51026535013740722, which contains 22 as substring.

Together with 159728729, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (159728791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 79864365 + 79864366.

It is an arithmetic number, because the mean of its divisors is an integer number (79864366).

Almost surely, 2^159728731 is an apocalyptic number.

159728731 is the 6756-th centered heptagonal number.

159728731 is a deficient number, since it is larger than the sum of its proper divisors (1).

159728731 is an equidigital number, since it uses as much as digits as its factorization.

159728731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 43.

The square root of 159728731 is about 12638.3832431209. The cubic root of 159728731 is about 542.5765425351.

The spelling of 159728731 in words is "one hundred fifty-nine million, seven hundred twenty-eight thousand, seven hundred thirty-one".