68817013 has 2 divisors, whose sum is σ = 68817014. Its totient is φ = 68817012.

The previous prime is 68817011. The next prime is 68817053. The reversal of 68817013 is 31071886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43996689 + 24820324 = 6633^2 + 4982^2 .

It is a cyclic number.

It is not a de Polignac number, because 68817013 - 2¹ = 68817011 is a prime.

Together with 68817011, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 68817013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68817011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34408506 + 34408507.

It is an arithmetic number, because the mean of its divisors is an integer number (34408507).

Almost surely, 2^68817013 is an apocalyptic number.

It is an amenable number.

68817013 is a deficient number, since it is larger than the sum of its proper divisors (1).

68817013 is an equidigital number, since it uses as much as digits as its factorization.

68817013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 68817013 is about 8295.6020275806. The cubic root of 68817013 is about 409.7936955346.

Adding to 68817013 its reverse (31071886), we get a palindrome (99888899).

The spelling of 68817013 in words is "sixty-eight million, eight hundred seventeen thousand, thirteen".