264507391 has 2 divisors, whose sum is σ = 264507392. Its totient is φ = 264507390.

The previous prime is 264507367. The next prime is 264507421. The reversal of 264507391 is 193705462.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 264507391 - 2¹¹ = 264505343 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 264507391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264507311) 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 as a sum of consecutive naturals, namely, 132253695 + 132253696.

It is an arithmetic number, because the mean of its divisors is an integer number (132253696).

Almost surely, 2^264507391 is an apocalyptic number.

264507391 is a deficient number, since it is larger than the sum of its proper divisors (1).

264507391 is an equidigital number, since it uses as much as digits as its factorization.

264507391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 264507391 is about 16263.6831929302. The cubic root of 264507391 is about 641.9175812844.

The spelling of 264507391 in words is "two hundred sixty-four million, five hundred seven thousand, three hundred ninety-one".