68814509 has 2 divisors, whose sum is σ = 68814510. Its totient is φ = 68814508.

The previous prime is 68814481. The next prime is 68814547. The reversal of 68814509 is 90541886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64802500 + 4012009 = 8050^2 + 2003^2 .

It is a cyclic number.

It is not a de Polignac number, because 68814509 - 2²⁰ = 67765933 is a prime.

It is a super-2 number, since 2×68814509² = 9470873297822162, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68834509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34407254 + 34407255.

It is an arithmetic number, because the mean of its divisors is an integer number (34407255).

Almost surely, 2^68814509 is an apocalyptic number.

It is an amenable number.

68814509 is a deficient number, since it is larger than the sum of its proper divisors (1).

68814509 is an equidigital number, since it uses as much as digits as its factorization.

68814509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 41.

The square root of 68814509 is about 8295.4511028635. The cubic root of 68814509 is about 409.7887251752.

The spelling of 68814509 in words is "sixty-eight million, eight hundred fourteen thousand, five hundred nine".