164919817 has 4 divisors (see below), whose sum is σ = 165036816. Its totient is φ = 164802820.

The previous prime is 164919803. The next prime is 164919827. The reversal of 164919817 is 718919461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 164919817 - 2¹⁵ = 164887049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164919827) 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 in 3 ways as a sum of consecutive naturals, for example, 56359 + ... + 59212.

It is an arithmetic number, because the mean of its divisors is an integer number (41259204).

Almost surely, 2^164919817 is an apocalyptic number.

It is an amenable number.

164919817 is a deficient number, since it is larger than the sum of its proper divisors (116999).

164919817 is a wasteful number, since it uses less digits than its factorization.

164919817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116998.

The product of its digits is 108864, while the sum is 46.

The square root of 164919817 is about 12842.1110803481. Note that the first 3 decimals coincide. The cubic root of 164919817 is about 548.3917947377.

The spelling of 164919817 in words is "one hundred sixty-four million, nine hundred nineteen thousand, eight hundred seventeen".