264685621 has 2 divisors, whose sum is σ = 264685622. Its totient is φ = 264685620.

The previous prime is 264685609. The next prime is 264685643. The reversal of 264685621 is 126586462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 242923396 + 21762225 = 15586^2 + 4665^2 .

It is a cyclic number.

It is not a de Polignac number, because 264685621 - 2⁷ = 264685493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264685601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132342810 + 132342811.

It is an arithmetic number, because the mean of its divisors is an integer number (132342811).

Almost surely, 2^264685621 is an apocalyptic number.

It is an amenable number.

264685621 is a deficient number, since it is larger than the sum of its proper divisors (1).

264685621 is an equidigital number, since it uses as much as digits as its factorization.

264685621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 40.

The square root of 264685621 is about 16269.1616563362. The cubic root of 264685621 is about 642.0617275819.

The spelling of 264685621 in words is "two hundred sixty-four million, six hundred eighty-five thousand, six hundred twenty-one".