168564481 has 2 divisors, whose sum is σ = 168564482. Its totient is φ = 168564480.

The previous prime is 168564457. The next prime is 168564491. The reversal of 168564481 is 184465861.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163200625 + 5363856 = 12775^2 + 2316^2 .

It is a cyclic number.

It is not a de Polignac number, because 168564481 - 2¹⁹ = 168040193 is a prime.

It is a super-2 number, since 2×168564481² = 56827968509598722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (168564421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84282240 + 84282241.

It is an arithmetic number, because the mean of its divisors is an integer number (84282241).

Almost surely, 2^168564481 is an apocalyptic number.

It is an amenable number.

168564481 is a deficient number, since it is larger than the sum of its proper divisors (1).

168564481 is an equidigital number, since it uses as much as digits as its factorization.

168564481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 184320, while the sum is 43.

The square root of 168564481 is about 12983.2384634959. The cubic root of 168564481 is about 552.4021445143.

It can be divided in two parts, 1685 and 64481, that added together give a palindrome (66166).

The spelling of 168564481 in words is "one hundred sixty-eight million, five hundred sixty-four thousand, four hundred eighty-one".