164391473 has 2 divisors, whose sum is σ = 164391474. Its totient is φ = 164391472.

The previous prime is 164391457. The next prime is 164391499. The reversal of 164391473 is 374193461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 141800464 + 22591009 = 11908^2 + 4753^2 .

It is a cyclic number.

It is not a de Polignac number, because 164391473 - 2⁴ = 164391457 is a prime.

It is not a weakly prime, because it can be changed into another prime (164391443) 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 as a sum of consecutive naturals, namely, 82195736 + 82195737.

It is an arithmetic number, because the mean of its divisors is an integer number (82195737).

Almost surely, 2^164391473 is an apocalyptic number.

It is an amenable number.

164391473 is a deficient number, since it is larger than the sum of its proper divisors (1).

164391473 is an equidigital number, since it uses as much as digits as its factorization.

164391473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 38.

The square root of 164391473 is about 12821.5238173939. The cubic root of 164391473 is about 547.8055513160.

The spelling of 164391473 in words is "one hundred sixty-four million, three hundred ninety-one thousand, four hundred seventy-three".