164494181 has 2 divisors, whose sum is σ = 164494182. Its totient is φ = 164494180.

The previous prime is 164494163. The next prime is 164494199. The reversal of 164494181 is 181494461.

It is a balanced prime because it is at equal distance from previous prime (164494163) and next prime (164494199).

It can be written as a sum of positive squares in only one way, i.e., 120802081 + 43692100 = 10991^2 + 6610^2 .

It is a cyclic number.

It is not a de Polignac number, because 164494181 - 2¹⁸ = 164232037 is a prime.

It is a super-2 number, since 2×164494181² = 54116671165721522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164494111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82247090 + 82247091.

It is an arithmetic number, because the mean of its divisors is an integer number (82247091).

Almost surely, 2^164494181 is an apocalyptic number.

It is an amenable number.

164494181 is a deficient number, since it is larger than the sum of its proper divisors (1).

164494181 is an equidigital number, since it uses as much as digits as its factorization.

164494181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 38.

The square root of 164494181 is about 12825.5284881365. The cubic root of 164494181 is about 547.9196129887.

The spelling of 164494181 in words is "one hundred sixty-four million, four hundred ninety-four thousand, one hundred eighty-one".