164531639 has 2 divisors, whose sum is σ = 164531640. Its totient is φ = 164531638.

The previous prime is 164531623. The next prime is 164531669. The reversal of 164531639 is 936135461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 164531639 - 2⁴ = 164531623 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164531669) 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 as a sum of consecutive naturals, namely, 82265819 + 82265820.

It is an arithmetic number, because the mean of its divisors is an integer number (82265820).

Almost surely, 2^164531639 is an apocalyptic number.

164531639 is a deficient number, since it is larger than the sum of its proper divisors (1).

164531639 is an equidigital number, since it uses as much as digits as its factorization.

164531639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 38.

The square root of 164531639 is about 12826.9886957150. The cubic root of 164531639 is about 547.9611999009.

The spelling of 164531639 in words is "one hundred sixty-four million, five hundred thirty-one thousand, six hundred thirty-nine".