68911121 has 2 divisors, whose sum is σ = 68911122. Its totient is φ = 68911120.

The previous prime is 68911111. The next prime is 68911133. The reversal of 68911121 is 12111986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40704400 + 28206721 = 6380^2 + 5311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68911121 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68911111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34455560 + 34455561.

It is an arithmetic number, because the mean of its divisors is an integer number (34455561).

Almost surely, 2^68911121 is an apocalyptic number.

It is an amenable number.

68911121 is a deficient number, since it is larger than the sum of its proper divisors (1).

68911121 is an equidigital number, since it uses as much as digits as its factorization.

68911121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 29.

The square root of 68911121 is about 8301.2722518901. The cubic root of 68911121 is about 409.9804095339.

The spelling of 68911121 in words is "sixty-eight million, nine hundred eleven thousand, one hundred twenty-one".