264888821 has 2 divisors, whose sum is σ = 264888822. Its totient is φ = 264888820.

The previous prime is 264888751. The next prime is 264888829. The reversal of 264888821 is 128888462.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215678596 + 49210225 = 14686^2 + 7015^2 .

It is a cyclic number.

It is not a de Polignac number, because 264888821 - 2²² = 260694517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264888829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132444410 + 132444411.

It is an arithmetic number, because the mean of its divisors is an integer number (132444411).

Almost surely, 2^264888821 is an apocalyptic number.

It is an amenable number.

264888821 is a deficient number, since it is larger than the sum of its proper divisors (1).

264888821 is an equidigital number, since it uses as much as digits as its factorization.

264888821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 393216, while the sum is 47.

The square root of 264888821 is about 16275.4054020169. The cubic root of 264888821 is about 642.2259898365.

The spelling of 264888821 in words is "two hundred sixty-four million, eight hundred eighty-eight thousand, eight hundred twenty-one".