68162309 has 2 divisors, whose sum is σ = 68162310. Its totient is φ = 68162308.

The previous prime is 68162261. The next prime is 68162321. The reversal of 68162309 is 90326186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52780225 + 15382084 = 7265^2 + 3922^2 .

It is a cyclic number.

It is not a de Polignac number, because 68162309 - 2¹² = 68158213 is a prime.

It is a super-2 number, since 2×68162309² = 9292200736422962, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68162909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34081154 + 34081155.

It is an arithmetic number, because the mean of its divisors is an integer number (34081155).

Almost surely, 2^68162309 is an apocalyptic number.

It is an amenable number.

68162309 is a deficient number, since it is larger than the sum of its proper divisors (1).

68162309 is an equidigital number, since it uses as much as digits as its factorization.

68162309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 68162309 is about 8256.0468143053. The cubic root of 68162309 is about 408.4900018377.

The spelling of 68162309 in words is "sixty-eight million, one hundred sixty-two thousand, three hundred nine".