164899221 has 4 divisors (see below), whose sum is σ = 219865632. Its totient is φ = 109932812.

The previous prime is 164899211. The next prime is 164899223. The reversal of 164899221 is 122998461.

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 164899221 - 2⁹ = 164898709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164899223) 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, 27483201 + ... + 27483206.

It is an arithmetic number, because the mean of its divisors is an integer number (54966408).

Almost surely, 2^164899221 is an apocalyptic number.

It is an amenable number.

164899221 is a deficient number, since it is larger than the sum of its proper divisors (54966411).

164899221 is an equidigital number, since it uses as much as digits as its factorization.

164899221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54966410.

The product of its digits is 62208, while the sum is 42.

The square root of 164899221 is about 12841.3091622311. The cubic root of 164899221 is about 548.3689651635.

The spelling of 164899221 in words is "one hundred sixty-four million, eight hundred ninety-nine thousand, two hundred twenty-one".