68812013 has 2 divisors, whose sum is σ = 68812014. Its totient is φ = 68812012.

The previous prime is 68811989. The next prime is 68812061. The reversal of 68812013 is 31021886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58033924 + 10778089 = 7618^2 + 3283^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68812013 is a prime.

It is a super-2 number, since 2×68812013² = 9470186266224338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68812213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34406006 + 34406007.

It is an arithmetic number, because the mean of its divisors is an integer number (34406007).

Almost surely, 2^68812013 is an apocalyptic number.

It is an amenable number.

68812013 is a deficient number, since it is larger than the sum of its proper divisors (1).

68812013 is an equidigital number, since it uses as much as digits as its factorization.

68812013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 68812013 is about 8295.3006576013. The cubic root of 68812013 is about 409.7837705756.

Adding to 68812013 its reverse (31021886), we get a palindrome (99833899).

The spelling of 68812013 in words is "sixty-eight million, eight hundred twelve thousand, thirteen".