264317681 has 2 divisors, whose sum is σ = 264317682. Its totient is φ = 264317680.

The previous prime is 264317671. The next prime is 264317701. The reversal of 264317681 is 186713462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 263770081 + 547600 = 16241^2 + 740^2 .

It is a cyclic number.

It is not a de Polignac number, because 264317681 - 2⁶ = 264317617 is a prime.

It is a super-2 number, since 2×264317681² = 139727672978435522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (264317621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132158840 + 132158841.

It is an arithmetic number, because the mean of its divisors is an integer number (132158841).

Almost surely, 2^264317681 is an apocalyptic number.

It is an amenable number.

264317681 is a deficient number, since it is larger than the sum of its proper divisors (1).

264317681 is an equidigital number, since it uses as much as digits as its factorization.

264317681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 38.

The square root of 264317681 is about 16257.8498270835. The cubic root of 264317681 is about 641.7640791971.

The spelling of 264317681 in words is "two hundred sixty-four million, three hundred seventeen thousand, six hundred eighty-one".