68073391 has 2 divisors, whose sum is σ = 68073392. Its totient is φ = 68073390.

The previous prime is 68073361. The next prime is 68073413. The reversal of 68073391 is 19337086.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68073391 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68073391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68073301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34036695 + 34036696.

It is an arithmetic number, because the mean of its divisors is an integer number (34036696).

Almost surely, 2^68073391 is an apocalyptic number.

68073391 is a deficient number, since it is larger than the sum of its proper divisors (1).

68073391 is an equidigital number, since it uses as much as digits as its factorization.

68073391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 68073391 is about 8250.6600342033. The cubic root of 68073391 is about 408.3122989396.

The spelling of 68073391 in words is "sixty-eight million, seventy-three thousand, three hundred ninety-one".