264521506 has 4 divisors (see below), whose sum is σ = 396782262. Its totient is φ = 132260752.

The previous prime is 264521503. The next prime is 264521531. The reversal of 264521506 is 605125462.

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

It can be written as a sum of positive squares in only one way, i.e., 212897281 + 51624225 = 14591^2 + 7185^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (264521503) 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, 66130375 + ... + 66130378.

Almost surely, 2^264521506 is an apocalyptic number.

264521506 is a deficient number, since it is larger than the sum of its proper divisors (132260756).

264521506 is a wasteful number, since it uses less digits than its factorization.

264521506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132260755.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 264521506 is about 16264.1171294356. The cubic root of 264521506 is about 641.9289993718.

Adding to 264521506 its reverse (605125462), we get a palindrome (869646968).

The spelling of 264521506 in words is "two hundred sixty-four million, five hundred twenty-one thousand, five hundred six".