264499621 has 2 divisors, whose sum is σ = 264499622. Its totient is φ = 264499620.

The previous prime is 264499619. The next prime is 264499639. The reversal of 264499621 is 126994462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213890625 + 50608996 = 14625^2 + 7114^2 .

It is a cyclic number.

It is not a de Polignac number, because 264499621 - 2¹ = 264499619 is a prime.

Together with 264499619, 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 (264499681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132249810 + 132249811.

It is an arithmetic number, because the mean of its divisors is an integer number (132249811).

Almost surely, 2^264499621 is an apocalyptic number.

It is an amenable number.

264499621 is a deficient number, since it is larger than the sum of its proper divisors (1).

264499621 is an equidigital number, since it uses as much as digits as its factorization.

264499621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 43.

The square root of 264499621 is about 16263.4443153964. Note that the first 3 decimals coincide. The cubic root of 264499621 is about 641.9112957027.

The spelling of 264499621 in words is "two hundred sixty-four million, four hundred ninety-nine thousand, six hundred twenty-one".