172336729 has 2 divisors, whose sum is σ = 172336730. Its totient is φ = 172336728.

The previous prime is 172336727. The next prime is 172336741. The reversal of 172336729 is 927633271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 157552704 + 14784025 = 12552^2 + 3845^2 .

It is a cyclic number.

It is not a de Polignac number, because 172336729 - 2¹ = 172336727 is a prime.

Together with 172336727, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 172336691 and 172336700.

It is not a weakly prime, because it can be changed into another prime (172336727) 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, 86168364 + 86168365.

It is an arithmetic number, because the mean of its divisors is an integer number (86168365).

Almost surely, 2^172336729 is an apocalyptic number.

It is an amenable number.

172336729 is a deficient number, since it is larger than the sum of its proper divisors (1).

172336729 is an equidigital number, since it uses as much as digits as its factorization.

172336729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 95256, while the sum is 40.

The square root of 172336729 is about 13127.7084443554. The cubic root of 172336729 is about 556.4924567911.

The spelling of 172336729 in words is "one hundred seventy-two million, three hundred thirty-six thousand, seven hundred twenty-nine".