264231521 has 4 divisors (see below), whose sum is σ = 275719872. Its totient is φ = 252743172.

The previous prime is 264231503. The next prime is 264231533. The reversal of 264231521 is 125132462.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 264231521 - 2¹⁴ = 264215137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (264231551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5744141 + ... + 5744186.

It is an arithmetic number, because the mean of its divisors is an integer number (68929968).

Almost surely, 2^264231521 is an apocalyptic number.

It is an amenable number.

264231521 is a deficient number, since it is larger than the sum of its proper divisors (11488351).

264231521 is a wasteful number, since it uses less digits than its factorization.

264231521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11488350.

The product of its digits is 2880, while the sum is 26.

The square root of 264231521 is about 16255.1998142133. The cubic root of 264231521 is about 641.6943393774.

Adding to 264231521 its reverse (125132462), we get a palindrome (389363983).

The spelling of 264231521 in words is "two hundred sixty-four million, two hundred thirty-one thousand, five hundred twenty-one".