764225509 has 2 divisors, whose sum is σ = 764225510. Its totient is φ = 764225508.

The previous prime is 764225477. The next prime is 764225519. The reversal of 764225509 is 905522467.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 666156100 + 98069409 = 25810^2 + 9903^2 .

It is a cyclic number.

It is not a de Polignac number, because 764225509 - 2⁵ = 764225477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (764225519) 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, 382112754 + 382112755.

It is an arithmetic number, because the mean of its divisors is an integer number (382112755).

Almost surely, 2^764225509 is an apocalyptic number.

It is an amenable number.

764225509 is a deficient number, since it is larger than the sum of its proper divisors (1).

764225509 is an equidigital number, since it uses as much as digits as its factorization.

764225509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 151200, while the sum is 40.

The square root of 764225509 is about 27644.6289358349. The cubic root of 764225509 is about 914.2686817732.

The spelling of 764225509 in words is "seven hundred sixty-four million, two hundred twenty-five thousand, five hundred nine".