164546221 has 8 divisors (see below), whose sum is σ = 191240640. Its totient is φ = 138648768.

The previous prime is 164546197. The next prime is 164546257. The reversal of 164546221 is 122645461.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 164546221 - 2⁷ = 164546093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164546021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198796 + ... + 199621.

It is an arithmetic number, because the mean of its divisors is an integer number (23905080).

Almost surely, 2^164546221 is an apocalyptic number.

It is an amenable number.

164546221 is a deficient number, since it is larger than the sum of its proper divisors (26694419).

164546221 is an equidigital number, since it uses as much as digits as its factorization.

164546221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398483.

The product of its digits is 11520, while the sum is 31.

The square root of 164546221 is about 12827.5570940066. The cubic root of 164546221 is about 547.9773875355.

The spelling of 164546221 in words is "one hundred sixty-four million, five hundred forty-six thousand, two hundred twenty-one".