264009509 has 4 divisors (see below), whose sum is σ = 264105216. Its totient is φ = 263913804.

The previous prime is 264009469. The next prime is 264009517. The reversal of 264009509 is 905900462.

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 264009509 - 2²⁰ = 262960933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264009569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43589 + ... + 49274.

It is an arithmetic number, because the mean of its divisors is an integer number (66026304).

Almost surely, 2^264009509 is an apocalyptic number.

It is an amenable number.

264009509 is a deficient number, since it is larger than the sum of its proper divisors (95707).

264009509 is an equidigital number, since it uses as much as digits as its factorization.

264009509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95706.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 264009509 is about 16248.3694258839. The cubic root of 264009509 is about 641.5145680390.

The spelling of 264009509 in words is "two hundred sixty-four million, nine thousand, five hundred nine".