64210609 has 2 divisors, whose sum is σ = 64210610. Its totient is φ = 64210608.

The previous prime is 64210607. The next prime is 64210639. The reversal of 64210609 is 90601246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63250209 + 960400 = 7953^2 + 980^2 .

It is a cyclic number.

It is not a de Polignac number, because 64210609 - 2¹ = 64210607 is a prime.

Together with 64210607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (64210603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32105304 + 32105305.

It is an arithmetic number, because the mean of its divisors is an integer number (32105305).

Almost surely, 2^64210609 is an apocalyptic number.

It is an amenable number.

64210609 is a deficient number, since it is larger than the sum of its proper divisors (1).

64210609 is an equidigital number, since it uses as much as digits as its factorization.

64210609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 64210609 is about 8013.1522511431. The cubic root of 64210609 is about 400.4382883329.

The spelling of 64210609 in words is "sixty-four million, two hundred ten thousand, six hundred nine".