164394621 has 6 divisors (see below), whose sum is σ = 237458910. Its totient is φ = 109596408.

The previous prime is 164394611. The next prime is 164394623. The reversal of 164394621 is 126493461.

164394621 is a `hidden beast` number, since 1 + 643 + 9 + 4 + 6 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 150332121 + 14062500 = 12261^2 + 3750^2 .

It is not a de Polignac number, because 164394621 - 2¹⁵ = 164361853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164394623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9133026 + ... + 9133043.

It is an arithmetic number, because the mean of its divisors is an integer number (39576485).

Almost surely, 2^164394621 is an apocalyptic number.

It is an amenable number.

164394621 is a deficient number, since it is larger than the sum of its proper divisors (73064289).

164394621 is a wasteful number, since it uses less digits than its factorization.

164394621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18266075 (or 18266072 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 164394621 is about 12821.6465791255. The cubic root of 164394621 is about 547.8090480117.

The spelling of 164394621 in words is "one hundred sixty-four million, three hundred ninety-four thousand, six hundred twenty-one".