68834509 has 2 divisors, whose sum is σ = 68834510. Its totient is φ = 68834508.

The previous prime is 68834503. The next prime is 68834537. The reversal of 68834509 is 90543886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68112009 + 722500 = 8253^2 + 850^2 .

It is a cyclic number.

It is not a de Polignac number, because 68834509 - 2⁹ = 68833997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68834503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34417254 + 34417255.

It is an arithmetic number, because the mean of its divisors is an integer number (34417255).

Almost surely, 2^68834509 is an apocalyptic number.

It is an amenable number.

68834509 is a deficient number, since it is larger than the sum of its proper divisors (1).

68834509 is an equidigital number, since it uses as much as digits as its factorization.

68834509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 43.

The square root of 68834509 is about 8296.6564952395. The cubic root of 68834509 is about 409.8284211674.

The spelling of 68834509 in words is "sixty-eight million, eight hundred thirty-four thousand, five hundred nine".