68691589 has 2 divisors, whose sum is σ = 68691590. Its totient is φ = 68691588.

The previous prime is 68691587. The next prime is 68691643. The reversal of 68691589 is 98519686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68194564 + 497025 = 8258^2 + 705^2 .

It is a cyclic number.

It is not a de Polignac number, because 68691589 - 2¹ = 68691587 is a prime.

Together with 68691587, 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 (68691583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34345794 + 34345795.

It is an arithmetic number, because the mean of its divisors is an integer number (34345795).

Almost surely, 2^68691589 is an apocalyptic number.

It is an amenable number.

68691589 is a deficient number, since it is larger than the sum of its proper divisors (1).

68691589 is an equidigital number, since it uses as much as digits as its factorization.

68691589 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 933120, while the sum is 52.

The square root of 68691589 is about 8288.0389115882. The cubic root of 68691589 is about 409.5445845498.

The spelling of 68691589 in words is "sixty-eight million, six hundred ninety-one thousand, five hundred eighty-nine".