264391 has 2 divisors, whose sum is σ = 264392. Its totient is φ = 264390.

The previous prime is 264371. The next prime is 264403. The reversal of 264391 is 193462.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 264391 - 2⁵ = 264359 is a prime.

It is a d-powerful number, because it can be written as 2¹¹ + 6² + 3⁴ + 4⁹ + 9² + 1 .

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132195 + 132196.

It is an arithmetic number, because the mean of its divisors is an integer number (132196).

2²⁶⁴³⁹¹ is an apocalyptic number.

264391 is a deficient number, since it is larger than the sum of its proper divisors (1).

264391 is an equidigital number, since it uses as much as digits as its factorization.

264391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 25.

The square root of 264391 is about 514.1896537271. The cubic root of 264391 is about 64.1823413291.

The spelling of 264391 in words is "two hundred sixty-four thousand, three hundred ninety-one".