164989423 has 2 divisors, whose sum is σ = 164989424. Its totient is φ = 164989422.

The previous prime is 164989421. The next prime is 164989457. The reversal of 164989423 is 324989461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 164989423 - 2¹ = 164989421 is a prime.

Together with 164989421, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164989421) 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, 82494711 + 82494712.

It is an arithmetic number, because the mean of its divisors is an integer number (82494712).

Almost surely, 2^164989423 is an apocalyptic number.

164989423 is a deficient number, since it is larger than the sum of its proper divisors (1).

164989423 is an equidigital number, since it uses as much as digits as its factorization.

164989423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 46.

The square root of 164989423 is about 12844.8208629003. The cubic root of 164989423 is about 548.4689352355.

It can be divided in two parts, 16498 and 9423, that added together give a square (25921 = 161²).

The spelling of 164989423 in words is "one hundred sixty-four million, nine hundred eighty-nine thousand, four hundred twenty-three".