68515393 has 2 divisors, whose sum is σ = 68515394. Its totient is φ = 68515392.

The previous prime is 68515361. The next prime is 68515397. The reversal of 68515393 is 39351586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67699984 + 815409 = 8228^2 + 903^2 .

It is a cyclic number.

It is not a de Polignac number, because 68515393 - 2⁵ = 68515361 is a prime.

It is not a weakly prime, because it can be changed into another prime (68515397) 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, 34257696 + 34257697.

It is an arithmetic number, because the mean of its divisors is an integer number (34257697).

Almost surely, 2^68515393 is an apocalyptic number.

It is an amenable number.

68515393 is a deficient number, since it is larger than the sum of its proper divisors (1).

68515393 is an equidigital number, since it uses as much as digits as its factorization.

68515393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97200, while the sum is 40.

The square root of 68515393 is about 8277.4025515254. The cubic root of 68515393 is about 409.1941199861.

The spelling of 68515393 in words is "sixty-eight million, five hundred fifteen thousand, three hundred ninety-three".