172161727 has 2 divisors, whose sum is σ = 172161728. Its totient is φ = 172161726.

The previous prime is 172161721. The next prime is 172161751. The reversal of 172161727 is 727161271.

It is a weak prime.

It is an emirp because it is prime and its reverse (727161271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172161727 - 2⁷ = 172161599 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 172161692 and 172161701.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172161721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86080863 + 86080864.

It is an arithmetic number, because the mean of its divisors is an integer number (86080864).

Almost surely, 2^172161727 is an apocalyptic number.

172161727 is a deficient number, since it is larger than the sum of its proper divisors (1).

172161727 is an equidigital number, since it uses as much as digits as its factorization.

172161727 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8232, while the sum is 34.

The square root of 172161727 is about 13121.0413839756. The cubic root of 172161727 is about 556.3040267012.

The spelling of 172161727 in words is "one hundred seventy-two million, one hundred sixty-one thousand, seven hundred twenty-seven".