68589991 has 2 divisors, whose sum is σ = 68589992. Its totient is φ = 68589990.

The previous prime is 68589973. The next prime is 68590013. The reversal of 68589991 is 19998586.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68589991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68589491) 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, 34294995 + 34294996.

It is an arithmetic number, because the mean of its divisors is an integer number (34294996).

Almost surely, 2^68589991 is an apocalyptic number.

68589991 is a deficient number, since it is larger than the sum of its proper divisors (1).

68589991 is an equidigital number, since it uses as much as digits as its factorization.

68589991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1399680, while the sum is 55.

The square root of 68589991 is about 8281.9074493742. The cubic root of 68589991 is about 409.3425732022.

It can be divided in two parts, 6858999 and 1, that added together give a cube (6859000 = 190³).

The spelling of 68589991 in words is "sixty-eight million, five hundred eighty-nine thousand, nine hundred ninety-one".