68309749 has 2 divisors, whose sum is σ = 68309750. Its totient is φ = 68309748.

The previous prime is 68309713. The next prime is 68309767. The reversal of 68309749 is 94790386.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65772100 + 2537649 = 8110^2 + 1593^2 .

It is a cyclic number.

It is not a de Polignac number, because 68309749 - 2¹⁹ = 67785461 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 68309699 and 68309708.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68303749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34154874 + 34154875.

It is an arithmetic number, because the mean of its divisors is an integer number (34154875).

Almost surely, 2^68309749 is an apocalyptic number.

It is an amenable number.

68309749 is a deficient number, since it is larger than the sum of its proper divisors (1).

68309749 is an equidigital number, since it uses as much as digits as its factorization.

68309749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 68309749 is about 8264.9712038216. The cubic root of 68309749 is about 408.7843208595.

The spelling of 68309749 in words is "sixty-eight million, three hundred nine thousand, seven hundred forty-nine".