68910913 has 2 divisors, whose sum is σ = 68910914. Its totient is φ = 68910912.

The previous prime is 68910901. The next prime is 68910943. The reversal of 68910913 is 31901986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68095504 + 815409 = 8252^2 + 903^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68910913 is a prime.

It is not a weakly prime, because it can be changed into another prime (68910943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34455456 + 34455457.

It is an arithmetic number, because the mean of its divisors is an integer number (34455457).

Almost surely, 2^68910913 is an apocalyptic number.

It is an amenable number.

68910913 is a deficient number, since it is larger than the sum of its proper divisors (1).

68910913 is an equidigital number, since it uses as much as digits as its factorization.

68910913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 68910913 is about 8301.2597236805. The cubic root of 68910913 is about 409.9799970412.

The spelling of 68910913 in words is "sixty-eight million, nine hundred ten thousand, nine hundred thirteen".