64839109 has 2 divisors, whose sum is σ = 64839110. Its totient is φ = 64839108.

The previous prime is 64839107. The next prime is 64839119. The reversal of 64839109 is 90193846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52519009 + 12320100 = 7247^2 + 3510^2 .

It is a cyclic number.

It is not a de Polignac number, because 64839109 - 2¹ = 64839107 is a prime.

It is a super-2 number, since 2×64839109² = 8408220111827762, which contains 22 as substring.

Together with 64839107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64839107) 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, 32419554 + 32419555.

It is an arithmetic number, because the mean of its divisors is an integer number (32419555).

Almost surely, 2^64839109 is an apocalyptic number.

It is an amenable number.

64839109 is a deficient number, since it is larger than the sum of its proper divisors (1).

64839109 is an equidigital number, since it uses as much as digits as its factorization.

64839109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 64839109 is about 8052.2735298796. The cubic root of 64839109 is about 401.7405589011.

The spelling of 64839109 in words is "sixty-four million, eight hundred thirty-nine thousand, one hundred nine".