164397217 has 4 divisors (see below), whose sum is σ = 164606896. Its totient is φ = 164187540.

The previous prime is 164397209. The next prime is 164397221. The reversal of 164397217 is 712793461.

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: 712793461 = 101 ⋅7057361.

It is a cyclic number.

It is not a de Polignac number, because 164397217 - 2³ = 164397209 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 164397217.

It is not an unprimeable number, because it can be changed into a prime (164397227) 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, 103659 + ... + 105232.

It is an arithmetic number, because the mean of its divisors is an integer number (41151724).

Almost surely, 2^164397217 is an apocalyptic number.

It is an amenable number.

164397217 is a deficient number, since it is larger than the sum of its proper divisors (209679).

164397217 is an equidigital number, since it uses as much as digits as its factorization.

164397217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209678.

The product of its digits is 63504, while the sum is 40.

The square root of 164397217 is about 12821.7478137733. The cubic root of 164397217 is about 547.8119315303.

The spelling of 164397217 in words is "one hundred sixty-four million, three hundred ninety-seven thousand, two hundred seventeen".