164219217 has 4 divisors (see below), whose sum is σ = 218958960. Its totient is φ = 109479476.

The previous prime is 164219191. The next prime is 164219219. The reversal of 164219217 is 712912461.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 164219217 - 2⁸ = 164218961 is a prime.

It is not an unprimeable number, because it can be changed into a prime (164219219) 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, 27369867 + ... + 27369872.

It is an arithmetic number, because the mean of its divisors is an integer number (54739740).

Almost surely, 2^164219217 is an apocalyptic number.

It is an amenable number.

164219217 is a deficient number, since it is larger than the sum of its proper divisors (54739743).

164219217 is an equidigital number, since it uses as much as digits as its factorization.

164219217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54739742.

The product of its digits is 6048, while the sum is 33.

The square root of 164219217 is about 12814.8046024900. The cubic root of 164219217 is about 547.6141468805.

The spelling of 164219217 in words is "one hundred sixty-four million, two hundred nineteen thousand, two hundred seventeen".