68868491 has 2 divisors, whose sum is σ = 68868492. Its totient is φ = 68868490.

The previous prime is 68868409. The next prime is 68868493. The reversal of 68868491 is 19486886.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68868491 - 2²⁶ = 1759627 is a prime.

Together with 68868493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68868493) 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, 34434245 + 34434246.

It is an arithmetic number, because the mean of its divisors is an integer number (34434246).

Almost surely, 2^68868491 is an apocalyptic number.

68868491 is a deficient number, since it is larger than the sum of its proper divisors (1).

68868491 is an equidigital number, since it uses as much as digits as its factorization.

68868491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 663552, while the sum is 50.

The square root of 68868491 is about 8298.7041759542. The cubic root of 68868491 is about 409.8958510000.

The spelling of 68868491 in words is "sixty-eight million, eight hundred sixty-eight thousand, four hundred ninety-one".