68134721 has 2 divisors, whose sum is σ = 68134722. Its totient is φ = 68134720.

The previous prime is 68134697. The next prime is 68134757. The reversal of 68134721 is 12743186.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37210000 + 30924721 = 6100^2 + 5561^2 .

It is a cyclic number.

It is not a de Polignac number, because 68134721 - 2¹⁸ = 67872577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68134771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34067360 + 34067361.

It is an arithmetic number, because the mean of its divisors is an integer number (34067361).

Almost surely, 2^68134721 is an apocalyptic number.

It is an amenable number.

68134721 is a deficient number, since it is larger than the sum of its proper divisors (1).

68134721 is an equidigital number, since it uses as much as digits as its factorization.

68134721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 32.

The square root of 68134721 is about 8254.3758698038. The cubic root of 68134721 is about 408.4348836790.

The spelling of 68134721 in words is "sixty-eight million, one hundred thirty-four thousand, seven hundred twenty-one".