264299681 has 2 divisors, whose sum is σ = 264299682. Its totient is φ = 264299680.

The previous prime is 264299597. The next prime is 264299687. The reversal of 264299681 is 186992462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 254689681 + 9610000 = 15959^2 + 3100^2 .

It is a cyclic number.

It is not a de Polignac number, because 264299681 - 2¹⁸ = 264037537 is a prime.

It is a super-2 number, since 2×264299681² = 139708642753403522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (264299687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132149840 + 132149841.

It is an arithmetic number, because the mean of its divisors is an integer number (132149841).

Almost surely, 2^264299681 is an apocalyptic number.

It is an amenable number.

264299681 is a deficient number, since it is larger than the sum of its proper divisors (1).

264299681 is an equidigital number, since it uses as much as digits as its factorization.

264299681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 373248, while the sum is 47.

The square root of 264299681 is about 16257.2962389199. The cubic root of 264299681 is about 641.7495108494.

The spelling of 264299681 in words is "two hundred sixty-four million, two hundred ninety-nine thousand, six hundred eighty-one".