68081213 has 2 divisors, whose sum is σ = 68081214. Its totient is φ = 68081212.

The previous prime is 68081137. The next prime is 68081263. The reversal of 68081213 is 31218086.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41434969 + 26646244 = 6437^2 + 5162^2 .

It is a cyclic number.

It is not a de Polignac number, because 68081213 - 2¹⁶ = 68015677 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68081263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34040606 + 34040607.

It is an arithmetic number, because the mean of its divisors is an integer number (34040607).

Almost surely, 2^68081213 is an apocalyptic number.

It is an amenable number.

68081213 is a deficient number, since it is larger than the sum of its proper divisors (1).

68081213 is an equidigital number, since it uses as much as digits as its factorization.

68081213 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 68081213 is about 8251.1340432694. The cubic root of 68081213 is about 408.3279374362.

Adding to 68081213 its reverse (31218086), we get a palindrome (99299299).

The spelling of 68081213 in words is "sixty-eight million, eighty-one thousand, two hundred thirteen".