68182409 has 2 divisors, whose sum is σ = 68182410. Its totient is φ = 68182408.

The previous prime is 68182399. The next prime is 68182417. The reversal of 68182409 is 90428186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66015625 + 2166784 = 8125^2 + 1472^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68182409 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (68182459) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34091204 + 34091205.

It is an arithmetic number, because the mean of its divisors is an integer number (34091205).

Almost surely, 2^68182409 is an apocalyptic number.

It is an amenable number.

68182409 is a deficient number, since it is larger than the sum of its proper divisors (1).

68182409 is an equidigital number, since it uses as much as digits as its factorization.

68182409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 68182409 is about 8257.2640141878. The cubic root of 68182409 is about 408.5301503314.

The spelling of 68182409 in words is "sixty-eight million, one hundred eighty-two thousand, four hundred nine".