64532309 has 2 divisors, whose sum is σ = 64532310. Its totient is φ = 64532308.

The previous prime is 64532267. The next prime is 64532339. The reversal of 64532309 is 90323546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41280625 + 23251684 = 6425^2 + 4822^2 .

It is a cyclic number.

It is not a de Polignac number, because 64532309 - 2¹² = 64528213 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64532339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32266154 + 32266155.

It is an arithmetic number, because the mean of its divisors is an integer number (32266155).

Almost surely, 2^64532309 is an apocalyptic number.

It is an amenable number.

64532309 is a deficient number, since it is larger than the sum of its proper divisors (1).

64532309 is an equidigital number, since it uses as much as digits as its factorization.

64532309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 64532309 is about 8033.2004207539. The cubic root of 64532309 is about 401.1059166364.

The spelling of 64532309 in words is "sixty-four million, five hundred thirty-two thousand, three hundred nine".