64369309 has 2 divisors, whose sum is σ = 64369310. Its totient is φ = 64369308.

The previous prime is 64369289. The next prime is 64369351. The reversal of 64369309 is 90396346.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57426084 + 6943225 = 7578^2 + 2635^2 .

It is a cyclic number.

It is not a de Polignac number, because 64369309 - 2⁷ = 64369181 is a prime.

It is a super-2 number, since 2×64369309² = 8286815882274962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64364309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32184654 + 32184655.

It is an arithmetic number, because the mean of its divisors is an integer number (32184655).

Almost surely, 2^64369309 is an apocalyptic number.

It is an amenable number.

64369309 is a deficient number, since it is larger than the sum of its proper divisors (1).

64369309 is an equidigital number, since it uses as much as digits as its factorization.

64369309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 40.

The square root of 64369309 is about 8023.0486100983. The cubic root of 64369309 is about 400.7679185593.

The spelling of 64369309 in words is "sixty-four million, three hundred sixty-nine thousand, three hundred nine".