172218227 has 16 divisors (see below), whose sum is σ = 184032000. Its totient is φ = 160806624.

The previous prime is 172218209. The next prime is 172218229. The reversal of 172218227 is 722812271.

It is not a de Polignac number, because 172218227 - 2²² = 168023923 is a prime.

It is a super-2 number, since 2×172218227² = 59318235422047058, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 172218193 and 172218202.

It is not an unprimeable number, because it can be changed into a prime (172218229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 242549 + ... + 243257.

It is an arithmetic number, because the mean of its divisors is an integer number (11502000).

Almost surely, 2^172218227 is an apocalyptic number.

172218227 is a deficient number, since it is larger than the sum of its proper divisors (11813773).

172218227 is a wasteful number, since it uses less digits than its factorization.

172218227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970.

The product of its digits is 6272, while the sum is 32.

The square root of 172218227 is about 13123.1942376847. The cubic root of 172218227 is about 556.3648759587.

The spelling of 172218227 in words is "one hundred seventy-two million, two hundred eighteen thousand, two hundred twenty-seven".