172663213 has 4 divisors (see below), whose sum is σ = 173158300. Its totient is φ = 172168128.

The previous prime is 172663163. The next prime is 172663219. The reversal of 172663213 is 312366271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 312366271 = 7 ⋅44623753.

It can be written as a sum of positive squares in 2 ways, for example, as 129458884 + 43204329 = 11378^2 + 6573^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172663213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172663219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247020 + ... + 247717.

It is an arithmetic number, because the mean of its divisors is an integer number (43289575).

Almost surely, 2^172663213 is an apocalyptic number.

It is an amenable number.

172663213 is a deficient number, since it is larger than the sum of its proper divisors (495087).

172663213 is an equidigital number, since it uses as much as digits as its factorization.

172663213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495086.

The product of its digits is 9072, while the sum is 31.

The square root of 172663213 is about 13140.1374802549. The cubic root of 172663213 is about 556.8436515578.

The spelling of 172663213 in words is "one hundred seventy-two million, six hundred sixty-three thousand, two hundred thirteen".