264581257 has 4 divisors (see below), whose sum is σ = 264838420. Its totient is φ = 264324096.

The previous prime is 264581231. The next prime is 264581293. The reversal of 264581257 is 752185462.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 213043216 + 51538041 = 14596^2 + 7179^2 .

It is a cyclic number.

It is not a de Polignac number, because 264581257 - 2¹⁵ = 264548489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (264581227) 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 in 3 ways as a sum of consecutive naturals, for example, 127032 + ... + 129097.

It is an arithmetic number, because the mean of its divisors is an integer number (66209605).

Almost surely, 2^264581257 is an apocalyptic number.

It is an amenable number.

264581257 is a deficient number, since it is larger than the sum of its proper divisors (257163).

264581257 is a wasteful number, since it uses less digits than its factorization.

264581257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257162.

The product of its digits is 134400, while the sum is 40.

The square root of 264581257 is about 16265.9539222266. The cubic root of 264581257 is about 641.9773294208.

The spelling of 264581257 in words is "two hundred sixty-four million, five hundred eighty-one thousand, two hundred fifty-seven".