22164581 has 2 divisors, whose sum is σ = 22164582. Its totient is φ = 22164580.

The previous prime is 22164557. The next prime is 22164599. The reversal of 22164581 is 18546122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22137025 + 27556 = 4705^2 + 166^2 .

It is a cyclic number.

It is not a de Polignac number, because 22164581 - 2¹⁴ = 22148197 is a prime.

It is a super-2 number, since 2×22164581² = 982537301811122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22164511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11082290 + 11082291.

It is an arithmetic number, because the mean of its divisors is an integer number (11082291).

Almost surely, 2^22164581 is an apocalyptic number.

It is an amenable number.

22164581 is a deficient number, since it is larger than the sum of its proper divisors (1).

22164581 is an equidigital number, since it uses as much as digits as its factorization.

22164581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 29.

The square root of 22164581 is about 4707.9274633325. The cubic root of 22164581 is about 280.9009288419.

The spelling of 22164581 in words is "twenty-two million, one hundred sixty-four thousand, five hundred eighty-one".