68144389 has 2 divisors, whose sum is σ = 68144390. Its totient is φ = 68144388.

The previous prime is 68144387. The next prime is 68144441. The reversal of 68144389 is 98344186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40424164 + 27720225 = 6358^2 + 5265^2 .

It is a cyclic number.

It is not a de Polignac number, because 68144389 - 2¹ = 68144387 is a prime.

Together with 68144387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68144387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34072194 + 34072195.

It is an arithmetic number, because the mean of its divisors is an integer number (34072195).

Almost surely, 2^68144389 is an apocalyptic number.

It is an amenable number.

68144389 is a deficient number, since it is larger than the sum of its proper divisors (1).

68144389 is an equidigital number, since it uses as much as digits as its factorization.

68144389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 43.

The square root of 68144389 is about 8254.9614778023. The cubic root of 68144389 is about 408.4542011021.

The spelling of 68144389 in words is "sixty-eight million, one hundred forty-four thousand, three hundred eighty-nine".