64413509 has 2 divisors, whose sum is σ = 64413510. Its totient is φ = 64413508.

The previous prime is 64413491. The next prime is 64413523. The reversal of 64413509 is 90531446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45185284 + 19228225 = 6722^2 + 4385^2 .

It is a cyclic number.

It is not a de Polignac number, because 64413509 - 2⁸ = 64413253 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 (64413539) 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, 32206754 + 32206755.

It is an arithmetic number, because the mean of its divisors is an integer number (32206755).

Almost surely, 2^64413509 is an apocalyptic number.

It is an amenable number.

64413509 is a deficient number, since it is larger than the sum of its proper divisors (1).

64413509 is an equidigital number, since it uses as much as digits as its factorization.

64413509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 64413509 is about 8025.8027012879. The cubic root of 64413509 is about 400.8596283577.

The spelling of 64413509 in words is "sixty-four million, four hundred thirteen thousand, five hundred nine".