172803217 has 2 divisors, whose sum is σ = 172803218. Its totient is φ = 172803216.

The previous prime is 172803193. The next prime is 172803227. The reversal of 172803217 is 712308271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124902976 + 47900241 = 11176^2 + 6921^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172803217 is a prime.

It is not a weakly prime, because it can be changed into another prime (172803227) 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, 86401608 + 86401609.

It is an arithmetic number, because the mean of its divisors is an integer number (86401609).

Almost surely, 2^172803217 is an apocalyptic number.

It is an amenable number.

172803217 is a deficient number, since it is larger than the sum of its proper divisors (1).

172803217 is an equidigital number, since it uses as much as digits as its factorization.

172803217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 172803217 is about 13145.4637422953. The cubic root of 172803217 is about 556.9941164915.

The spelling of 172803217 in words is "one hundred seventy-two million, eight hundred three thousand, two hundred seventeen".