164881979 has 2 divisors, whose sum is σ = 164881980. Its totient is φ = 164881978.

The previous prime is 164881973. The next prime is 164881987. The reversal of 164881979 is 979188461.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164881979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 164881979.

It is not a weakly prime, because it can be changed into another prime (164881973) 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, 82440989 + 82440990.

It is an arithmetic number, because the mean of its divisors is an integer number (82440990).

Almost surely, 2^164881979 is an apocalyptic number.

164881979 is a deficient number, since it is larger than the sum of its proper divisors (1).

164881979 is an equidigital number, since it uses as much as digits as its factorization.

164881979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 53.

The square root of 164881979 is about 12840.6377956860. The cubic root of 164881979 is about 548.3498518586.

The spelling of 164881979 in words is "one hundred sixty-four million, eight hundred eighty-one thousand, nine hundred seventy-nine".