68211613 has 2 divisors, whose sum is σ = 68211614. Its totient is φ = 68211612.

The previous prime is 68211607. The next prime is 68211623. The reversal of 68211613 is 31611286.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58644964 + 9566649 = 7658^2 + 3093^2 .

It is a cyclic number.

It is not a de Polignac number, because 68211613 - 2⁵ = 68211581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68211623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34105806 + 34105807.

It is an arithmetic number, because the mean of its divisors is an integer number (34105807).

Almost surely, 2^68211613 is an apocalyptic number.

It is an amenable number.

68211613 is a deficient number, since it is larger than the sum of its proper divisors (1).

68211613 is an equidigital number, since it uses as much as digits as its factorization.

68211613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 28.

The square root of 68211613 is about 8259.0322072262. The cubic root of 68211613 is about 408.5884694380.

Adding to 68211613 its reverse (31611286), we get a palindrome (99822899).

The spelling of 68211613 in words is "sixty-eight million, two hundred eleven thousand, six hundred thirteen".