172706647 has 2 divisors, whose sum is σ = 172706648. Its totient is φ = 172706646.

The previous prime is 172706627. The next prime is 172706671. The reversal of 172706647 is 746607271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172706647 - 2¹⁹ = 172182359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172706617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86353323 + 86353324.

It is an arithmetic number, because the mean of its divisors is an integer number (86353324).

Almost surely, 2^172706647 is an apocalyptic number.

172706647 is a deficient number, since it is larger than the sum of its proper divisors (1).

172706647 is an equidigital number, since it uses as much as digits as its factorization.

172706647 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 98784, while the sum is 40.

The square root of 172706647 is about 13141.7900987651. The cubic root of 172706647 is about 556.8903395948.

The spelling of 172706647 in words is "one hundred seventy-two million, seven hundred six thousand, six hundred forty-seven".