68144939 has 2 divisors, whose sum is σ = 68144940. Its totient is φ = 68144938.

The previous prime is 68144933. The next prime is 68144953. The reversal of 68144939 is 93944186.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68144939 - 2⁸ = 68144683 is a prime.

It is a super-2 number, since 2×68144939² = 9287465422627442, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 68144939.

It is not a weakly prime, because it can be changed into another prime (68144933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34072469 + 34072470.

It is an arithmetic number, because the mean of its divisors is an integer number (34072470).

Almost surely, 2^68144939 is an apocalyptic number.

68144939 is a deficient number, since it is larger than the sum of its proper divisors (1).

68144939 is an equidigital number, since it uses as much as digits as its factorization.

68144939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 44.

The square root of 68144939 is about 8254.9947910341. The cubic root of 68144939 is about 408.4552999903.

The spelling of 68144939 in words is "sixty-eight million, one hundred forty-four thousand, nine hundred thirty-nine".