264517989 has 4 divisors (see below), whose sum is σ = 352690656. Its totient is φ = 176345324.

The previous prime is 264517949. The next prime is 264517997. The reversal of 264517989 is 989715462.

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 264517989 - 2¹⁶ = 264452453 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (264517949) 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, 44086329 + ... + 44086334.

It is an arithmetic number, because the mean of its divisors is an integer number (88172664).

Almost surely, 2^264517989 is an apocalyptic number.

It is an amenable number.

264517989 is a deficient number, since it is larger than the sum of its proper divisors (88172667).

264517989 is an equidigital number, since it uses as much as digits as its factorization.

264517989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88172666.

The product of its digits is 1088640, while the sum is 51.

The square root of 264517989 is about 16264.0090076217. The cubic root of 264517989 is about 641.9261543929.

The spelling of 264517989 in words is "two hundred sixty-four million, five hundred seventeen thousand, nine hundred eighty-nine".