164494639 has 2 divisors, whose sum is σ = 164494640. Its totient is φ = 164494638.

The previous prime is 164494633. The next prime is 164494691. The reversal of 164494639 is 936494461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 164494639 - 2¹⁹ = 163970351 is a prime.

It is a super-3 number, since 3×164494639³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164494633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82247319 + 82247320.

It is an arithmetic number, because the mean of its divisors is an integer number (82247320).

Almost surely, 2^164494639 is an apocalyptic number.

164494639 is a deficient number, since it is larger than the sum of its proper divisors (1).

164494639 is an equidigital number, since it uses as much as digits as its factorization.

164494639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 46.

The square root of 164494639 is about 12825.5463431388. The cubic root of 164494639 is about 547.9201215111.

The spelling of 164494639 in words is "one hundred sixty-four million, four hundred ninety-four thousand, six hundred thirty-nine".