264405257 has 2 divisors, whose sum is σ = 264405258. Its totient is φ = 264405256.

The previous prime is 264405247. The next prime is 264405289. The reversal of 264405257 is 752504462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 264355081 + 50176 = 16259^2 + 224^2 .

It is a cyclic number.

It is not a de Polignac number, because 264405257 - 2¹⁶ = 264339721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (264405247) 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, 132202628 + 132202629.

It is an arithmetic number, because the mean of its divisors is an integer number (132202629).

Almost surely, 2^264405257 is an apocalyptic number.

It is an amenable number.

264405257 is a deficient number, since it is larger than the sum of its proper divisors (1).

264405257 is an equidigital number, since it uses as much as digits as its factorization.

264405257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 67200, while the sum is 35.

The square root of 264405257 is about 16260.5429491146. The cubic root of 264405257 is about 641.8349496294.

The spelling of 264405257 in words is "two hundred sixty-four million, four hundred five thousand, two hundred fifty-seven".