68424509 has 2 divisors, whose sum is σ = 68424510. Its totient is φ = 68424508.

The previous prime is 68424469. The next prime is 68424523. The reversal of 68424509 is 90542486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48372025 + 20052484 = 6955^2 + 4478^2 .

It is a cyclic number.

It is not a de Polignac number, because 68424509 - 2¹² = 68420413 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 (68424569) 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, 34212254 + 34212255.

It is an arithmetic number, because the mean of its divisors is an integer number (34212255).

Almost surely, 2^68424509 is an apocalyptic number.

It is an amenable number.

68424509 is a deficient number, since it is larger than the sum of its proper divisors (1).

68424509 is an equidigital number, since it uses as much as digits as its factorization.

68424509 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 38.

The square root of 68424509 is about 8271.9108433300. The cubic root of 68424509 is about 409.0131112501.

The spelling of 68424509 in words is "sixty-eight million, four hundred twenty-four thousand, five hundred nine".