68537939 has 2 divisors, whose sum is σ = 68537940. Its totient is φ = 68537938.

The previous prime is 68537927. The next prime is 68537941. The reversal of 68537939 is 93973586.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68537939 is a prime.

Together with 68537941, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68537039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34268969 + 34268970.

It is an arithmetic number, because the mean of its divisors is an integer number (34268970).

Almost surely, 2^68537939 is an apocalyptic number.

68537939 is a deficient number, since it is larger than the sum of its proper divisors (1).

68537939 is an equidigital number, since it uses as much as digits as its factorization.

68537939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1224720, while the sum is 50.

The square root of 68537939 is about 8278.7643401657. The cubic root of 68537939 is about 409.2389988494.

The spelling of 68537939 in words is "sixty-eight million, five hundred thirty-seven thousand, nine hundred thirty-nine".