164461221 has 6 divisors (see below), whose sum is σ = 237555110. Its totient is φ = 109640808.

The previous prime is 164461181. The next prime is 164461237. The reversal of 164461221 is 122164461.

164461221 is a `hidden beast` number, since 1 + 6 + 44 + 612 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 141276996 + 23184225 = 11886^2 + 4815^2 .

It is not a de Polignac number, because 164461221 - 2²² = 160266917 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 (164461421) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9136726 + ... + 9136743.

Almost surely, 2^164461221 is an apocalyptic number.

It is an amenable number.

164461221 is a deficient number, since it is larger than the sum of its proper divisors (73093889).

164461221 is a wasteful number, since it uses less digits than its factorization.

164461221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18273475 (or 18273472 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 164461221 is about 12824.2434864595. The cubic root of 164461221 is about 547.8830146591.

The spelling of 164461221 in words is "one hundred sixty-four million, four hundred sixty-one thousand, two hundred twenty-one".