68907121 has 2 divisors, whose sum is σ = 68907122. Its totient is φ = 68907120.

The previous prime is 68907077. The next prime is 68907169. The reversal of 68907121 is 12170986.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46240000 + 22667121 = 6800^2 + 4761^2 .

It is a cyclic number.

It is not a de Polignac number, because 68907121 - 2⁷ = 68906993 is a prime.

It is not a weakly prime, because it can be changed into another prime (68907821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34453560 + 34453561.

It is an arithmetic number, because the mean of its divisors is an integer number (34453561).

Almost surely, 2^68907121 is an apocalyptic number.

It is an amenable number.

68907121 is a deficient number, since it is larger than the sum of its proper divisors (1).

68907121 is an equidigital number, since it uses as much as digits as its factorization.

68907121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 68907121 is about 8301.0313214684. The cubic root of 68907121 is about 409.9724768357.

The spelling of 68907121 in words is "sixty-eight million, nine hundred seven thousand, one hundred twenty-one".