68468509 has 2 divisors, whose sum is σ = 68468510. Its totient is φ = 68468508.

The previous prime is 68468489. The next prime is 68468557. The reversal of 68468509 is 90586486.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51079609 + 17388900 = 7147^2 + 4170^2 .

It is a cyclic number.

It is not a de Polignac number, because 68468509 - 2¹⁹ = 67944221 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68468579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34234254 + 34234255.

It is an arithmetic number, because the mean of its divisors is an integer number (34234255).

Almost surely, 2^68468509 is an apocalyptic number.

It is an amenable number.

68468509 is a deficient number, since it is larger than the sum of its proper divisors (1).

68468509 is an equidigital number, since it uses as much as digits as its factorization.

68468509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414720, while the sum is 46.

The square root of 68468509 is about 8274.5700190403. The cubic root of 68468509 is about 409.1007636668.

The spelling of 68468509 in words is "sixty-eight million, four hundred sixty-eight thousand, five hundred nine".