68143897 has 2 divisors, whose sum is σ = 68143898. Its totient is φ = 68143896.

The previous prime is 68143813. The next prime is 68143903. The reversal of 68143897 is 79834186.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60902416 + 7241481 = 7804^2 + 2691^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68143897 is a prime.

It is not a weakly prime, because it can be changed into another prime (68143597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34071948 + 34071949.

It is an arithmetic number, because the mean of its divisors is an integer number (34071949).

Almost surely, 2^68143897 is an apocalyptic number.

It is an amenable number.

68143897 is a deficient number, since it is larger than the sum of its proper divisors (1).

68143897 is an equidigital number, since it uses as much as digits as its factorization.

68143897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 46.

The square root of 68143897 is about 8254.9316774883. The cubic root of 68143897 is about 408.4532180916.

The spelling of 68143897 in words is "sixty-eight million, one hundred forty-three thousand, eight hundred ninety-seven".