172218201 has 4 divisors (see below), whose sum is σ = 229624272. Its totient is φ = 114812132.

The previous prime is 172218197. The next prime is 172218209. The reversal of 172218201 is 102812271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 102812271 = 3 ⋅34270757.

It is a cyclic number.

It is not a de Polignac number, because 172218201 - 2² = 172218197 is a prime.

It is not an unprimeable number, because it can be changed into a prime (172218209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28703031 + ... + 28703036.

It is an arithmetic number, because the mean of its divisors is an integer number (57406068).

Almost surely, 2^172218201 is an apocalyptic number.

It is an amenable number.

172218201 is a deficient number, since it is larger than the sum of its proper divisors (57406071).

172218201 is an equidigital number, since it uses as much as digits as its factorization.

172218201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57406070.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 172218201 is about 13123.1932470721. The cubic root of 172218201 is about 556.3648479604.

The spelling of 172218201 in words is "one hundred seventy-two million, two hundred eighteen thousand, two hundred one".