164191982 has 4 divisors (see below), whose sum is σ = 246287976. Its totient is φ = 82095990.

The previous prime is 164191981. The next prime is 164191999. The reversal of 164191982 is 289191461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 289191461 = 13 ⋅22245497.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164191981) 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, 41047994 + ... + 41047997.

It is an arithmetic number, because the mean of its divisors is an integer number (61571994).

Almost surely, 2^164191982 is an apocalyptic number.

164191982 is a deficient number, since it is larger than the sum of its proper divisors (82095994).

164191982 is an equidigital number, since it uses as much as digits as its factorization.

164191982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82095993.

The product of its digits is 31104, while the sum is 41.

The square root of 164191982 is about 12813.7419202979. The cubic root of 164191982 is about 547.5838721130.

The spelling of 164191982 in words is "one hundred sixty-four million, one hundred ninety-one thousand, nine hundred eighty-two".