164178493 has 2 divisors, whose sum is σ = 164178494. Its totient is φ = 164178492.

The previous prime is 164178479. The next prime is 164178499. The reversal of 164178493 is 394871461.

164178493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121837444 + 42341049 = 11038^2 + 6507^2 .

It is a cyclic number.

It is not a de Polignac number, because 164178493 - 2⁵ = 164178461 is a prime.

It is equal to p_9195595 and since 164178493 and 9195595 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164178499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82089246 + 82089247.

It is an arithmetic number, because the mean of its divisors is an integer number (82089247).

Almost surely, 2^164178493 is an apocalyptic number.

It is an amenable number.

164178493 is a deficient number, since it is larger than the sum of its proper divisors (1).

164178493 is an equidigital number, since it uses as much as digits as its factorization.

164178493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 43.

The square root of 164178493 is about 12813.2155605063. The cubic root of 164178493 is about 547.5688763317.

The spelling of 164178493 in words is "one hundred sixty-four million, one hundred seventy-eight thousand, four hundred ninety-three".