172543729 has 2 divisors, whose sum is σ = 172543730. Its totient is φ = 172543728.

The previous prime is 172543717. The next prime is 172543741. The reversal of 172543729 is 927345271.

172543729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (172543717) and next prime (172543741).

It can be written as a sum of positive squares in only one way, i.e., 156125025 + 16418704 = 12495^2 + 4052^2 .

It is a cyclic number.

It is not a de Polignac number, because 172543729 - 2⁷ = 172543601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 172543691 and 172543700.

It is not a weakly prime, because it can be changed into another prime (172543529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86271864 + 86271865.

It is an arithmetic number, because the mean of its divisors is an integer number (86271865).

Almost surely, 2^172543729 is an apocalyptic number.

It is an amenable number.

172543729 is a deficient number, since it is larger than the sum of its proper divisors (1).

172543729 is an equidigital number, since it uses as much as digits as its factorization.

172543729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 40.

The square root of 172543729 is about 13135.5901656530. The cubic root of 172543729 is about 556.7151755131.

It can be divided in two parts, 1725 and 43729, that added together give a palindrome (45454).

The spelling of 172543729 in words is "one hundred seventy-two million, five hundred forty-three thousand, seven hundred twenty-nine".