172257929 has 2 divisors, whose sum is σ = 172257930. Its totient is φ = 172257928.

The previous prime is 172257913. The next prime is 172257947. The reversal of 172257929 is 929752271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165765625 + 6492304 = 12875^2 + 2548^2 .

It is a cyclic number.

It is not a de Polignac number, because 172257929 - 2⁴ = 172257913 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 172257929.

It is not a weakly prime, because it can be changed into another prime (172257959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86128964 + 86128965.

It is an arithmetic number, because the mean of its divisors is an integer number (86128965).

Almost surely, 2^172257929 is an apocalyptic number.

It is an amenable number.

172257929 is a deficient number, since it is larger than the sum of its proper divisors (1).

172257929 is an equidigital number, since it uses as much as digits as its factorization.

172257929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 158760, while the sum is 44.

The square root of 172257929 is about 13124.7068157731. The cubic root of 172257929 is about 556.4076261784.

The spelling of 172257929 in words is "one hundred seventy-two million, two hundred fifty-seven thousand, nine hundred twenty-nine".