264764021 has 2 divisors, whose sum is σ = 264764022. Its totient is φ = 264764020.

The previous prime is 264764011. The next prime is 264764033. The reversal of 264764021 is 120467462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 212722225 + 52041796 = 14585^2 + 7214^2 .

It is a cyclic number.

It is not a de Polignac number, because 264764021 - 2⁶ = 264763957 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264764011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132382010 + 132382011.

It is an arithmetic number, because the mean of its divisors is an integer number (132382011).

Almost surely, 2^264764021 is an apocalyptic number.

It is an amenable number.

264764021 is a deficient number, since it is larger than the sum of its proper divisors (1).

264764021 is an equidigital number, since it uses as much as digits as its factorization.

264764021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 264764021 is about 16271.5709444417. The cubic root of 264764021 is about 642.1251143147.

The spelling of 264764021 in words is "two hundred sixty-four million, seven hundred sixty-four thousand, twenty-one".