68981389 has 2 divisors, whose sum is σ = 68981390. Its totient is φ = 68981388.

The previous prime is 68981377. The next prime is 68981449. The reversal of 68981389 is 98318986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47032164 + 21949225 = 6858^2 + 4685^2 .

It is a cyclic number.

It is not a de Polignac number, because 68981389 - 2²³ = 60592781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68981309) 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, 34490694 + 34490695.

It is an arithmetic number, because the mean of its divisors is an integer number (34490695).

Almost surely, 2^68981389 is an apocalyptic number.

It is an amenable number.

68981389 is a deficient number, since it is larger than the sum of its proper divisors (1).

68981389 is an equidigital number, since it uses as much as digits as its factorization.

68981389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 52.

The square root of 68981389 is about 8305.5035368122. The cubic root of 68981389 is about 410.1197132081.

The spelling of 68981389 in words is "sixty-eight million, nine hundred eighty-one thousand, three hundred eighty-nine".