264721291 has 4 divisors (see below), whose sum is σ = 266345512. Its totient is φ = 263097072.

The previous prime is 264721277. The next prime is 264721339. The reversal of 264721291 is 192127462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 192127462 = 2 ⋅96063731.

It is a cyclic number.

It is not a de Polignac number, because 264721291 - 2²⁷ = 130503563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (264721231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 811866 + ... + 812191.

It is an arithmetic number, because the mean of its divisors is an integer number (66586378).

Almost surely, 2^264721291 is an apocalyptic number.

264721291 is a deficient number, since it is larger than the sum of its proper divisors (1624221).

264721291 is a wasteful number, since it uses less digits than its factorization.

264721291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624220.

The product of its digits is 12096, while the sum is 34.

The square root of 264721291 is about 16270.2578651969. The cubic root of 264721291 is about 642.0905684800.

The spelling of 264721291 in words is "two hundred sixty-four million, seven hundred twenty-one thousand, two hundred ninety-one".