264445381 has 2 divisors, whose sum is σ = 264445382. Its totient is φ = 264445380.

The previous prime is 264445373. The next prime is 264445417. The reversal of 264445381 is 183544462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 236882881 + 27562500 = 15391^2 + 5250^2 .

It is a cyclic number.

It is not a de Polignac number, because 264445381 - 2³ = 264445373 is a prime.

It is a super-2 number, since 2×264445381² = 139862719064470322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 264445381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (264445301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132222690 + 132222691.

It is an arithmetic number, because the mean of its divisors is an integer number (132222691).

Almost surely, 2^264445381 is an apocalyptic number.

It is an amenable number.

264445381 is a deficient number, since it is larger than the sum of its proper divisors (1).

264445381 is an equidigital number, since it uses as much as digits as its factorization.

264445381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 92160, while the sum is 37.

The square root of 264445381 is about 16261.7766864510. The cubic root of 264445381 is about 641.8674145448.

The spelling of 264445381 in words is "two hundred sixty-four million, four hundred forty-five thousand, three hundred eighty-one".