68642113 has 2 divisors, whose sum is σ = 68642114. Its totient is φ = 68642112.

The previous prime is 68642111. The next prime is 68642129. The reversal of 68642113 is 31124686.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50808384 + 17833729 = 7128^2 + 4223^2 .

It is a cyclic number.

It is not a de Polignac number, because 68642113 - 2¹ = 68642111 is a prime.

Together with 68642111, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (68642111) 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, 34321056 + 34321057.

It is an arithmetic number, because the mean of its divisors is an integer number (34321057).

Almost surely, 2^68642113 is an apocalyptic number.

It is an amenable number.

68642113 is a deficient number, since it is larger than the sum of its proper divisors (1).

68642113 is an equidigital number, since it uses as much as digits as its factorization.

68642113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 31.

The square root of 68642113 is about 8285.0535906535. The cubic root of 68642113 is about 409.4462343495.

Adding to 68642113 its reverse (31124686), we get a palindrome (99766799).

The spelling of 68642113 in words is "sixty-eight million, six hundred forty-two thousand, one hundred thirteen".