172132729 has 2 divisors, whose sum is σ = 172132730. Its totient is φ = 172132728.

The previous prime is 172132717. The next prime is 172132747. The reversal of 172132729 is 927231271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171610000 + 522729 = 13100^2 + 723^2 .

It is a cyclic number.

It is not a de Polignac number, because 172132729 - 2¹¹ = 172130681 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 172132694 and 172132703.

It is not a weakly prime, because it can be changed into another prime (172139729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86066364 + 86066365.

It is an arithmetic number, because the mean of its divisors is an integer number (86066365).

Almost surely, 2^172132729 is an apocalyptic number.

It is an amenable number.

172132729 is a deficient number, since it is larger than the sum of its proper divisors (1).

172132729 is an equidigital number, since it uses as much as digits as its factorization.

172132729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 34.

The square root of 172132729 is about 13119.9363184430. The cubic root of 172132729 is about 556.2727913230.

The spelling of 172132729 in words is "one hundred seventy-two million, one hundred thirty-two thousand, seven hundred twenty-nine".