68949989 has 2 divisors, whose sum is σ = 68949990. Its totient is φ = 68949988.

The previous prime is 68949971. The next prime is 68950019. The reversal of 68949989 is 98994986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46812964 + 22137025 = 6842^2 + 4705^2 .

It is a cyclic number.

It is not a de Polignac number, because 68949989 - 2¹² = 68945893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68949919) 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, 34474994 + 34474995.

It is an arithmetic number, because the mean of its divisors is an integer number (34474995).

Almost surely, 2^68949989 is an apocalyptic number.

It is an amenable number.

68949989 is a deficient number, since it is larger than the sum of its proper divisors (1).

68949989 is an equidigital number, since it uses as much as digits as its factorization.

68949989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10077696, while the sum is 62.

The square root of 68949989 is about 8303.6130088053. The cubic root of 68949989 is about 410.0574755831.

The spelling of 68949989 in words is "sixty-eight million, nine hundred forty-nine thousand, nine hundred eighty-nine".