172122203 has 4 divisors (see below), whose sum is σ = 187769688. Its totient is φ = 156474720.

The previous prime is 172122157. The next prime is 172122239. The reversal of 172122203 is 302221271.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 172122203 - 2¹⁰ = 172121179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172122253) 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 in 3 ways as a sum of consecutive naturals, for example, 7823726 + ... + 7823747.

It is an arithmetic number, because the mean of its divisors is an integer number (46942422).

Almost surely, 2^172122203 is an apocalyptic number.

172122203 is a deficient number, since it is larger than the sum of its proper divisors (15647485).

172122203 is a wasteful number, since it uses less digits than its factorization.

172122203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15647484.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 172122203 is about 13119.5351670705. The cubic root of 172122203 is about 556.2614523081.

Adding to 172122203 its reverse (302221271), we get a palindrome (474343474).

The spelling of 172122203 in words is "one hundred seventy-two million, one hundred twenty-two thousand, two hundred three".