164220971 has 4 divisors (see below), whose sum is σ = 172864200. Its totient is φ = 155577744.

The previous prime is 164220883. The next prime is 164220983. The reversal of 164220971 is 179022461.

It is a happy number.

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 164220971 - 2¹⁸ = 163958827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164220071) 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, 4321586 + ... + 4321623.

It is an arithmetic number, because the mean of its divisors is an integer number (43216050).

Almost surely, 2^164220971 is an apocalyptic number.

164220971 is a deficient number, since it is larger than the sum of its proper divisors (8643229).

164220971 is an equidigital number, since it uses as much as digits as its factorization.

164220971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8643228.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 164220971 is about 12814.8730387780. The cubic root of 164220971 is about 547.6160965342.

The spelling of 164220971 in words is "one hundred sixty-four million, two hundred twenty thousand, nine hundred seventy-one".