264991 has 2 divisors, whose sum is σ = 264992. Its totient is φ = 264990.

The previous prime is 264977. The next prime is 264997. The reversal of 264991 is 199462.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 264991 - 2⁵ = 264959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132495 + 132496.

It is an arithmetic number, because the mean of its divisors is an integer number (132496).

2²⁶⁴⁹⁹¹ is an apocalyptic number.

264991 is a deficient number, since it is larger than the sum of its proper divisors (1).

264991 is an equidigital number, since it uses as much as digits as its factorization.

264991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 31.

The square root of 264991 is about 514.7727654024. The cubic root of 264991 is about 64.2308557274.

The spelling of 264991 in words is "two hundred sixty-four thousand, nine hundred ninety-one".