264655021 has 2 divisors, whose sum is σ = 264655022. Its totient is φ = 264655020.

The previous prime is 264655019. The next prime is 264655033. The reversal of 264655021 is 120556462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179184996 + 85470025 = 13386^2 + 9245^2 .

It is a cyclic number.

It is not a de Polignac number, because 264655021 - 2¹ = 264655019 is a prime.

Together with 264655019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264655051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132327510 + 132327511.

It is an arithmetic number, because the mean of its divisors is an integer number (132327511).

Almost surely, 2^264655021 is an apocalyptic number.

It is an amenable number.

264655021 is a deficient number, since it is larger than the sum of its proper divisors (1).

264655021 is an equidigital number, since it uses as much as digits as its factorization.

264655021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 264655021 is about 16268.2211996272. The cubic root of 264655021 is about 642.0369839559.

The spelling of 264655021 in words is "two hundred sixty-four million, six hundred fifty-five thousand, twenty-one".