68411809 has 2 divisors, whose sum is σ = 68411810. Its totient is φ = 68411808.

The previous prime is 68411801. The next prime is 68411813. The reversal of 68411809 is 90811486.

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., 52635025 + 15776784 = 7255^2 + 3972^2 .

It is a cyclic number.

It is not a de Polignac number, because 68411809 - 2³ = 68411801 is a prime.

It is a super-2 number, since 2×68411809² = 9360351221304962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68411801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34205904 + 34205905.

It is an arithmetic number, because the mean of its divisors is an integer number (34205905).

Almost surely, 2^68411809 is an apocalyptic number.

It is an amenable number.

68411809 is a deficient number, since it is larger than the sum of its proper divisors (1).

68411809 is an equidigital number, since it uses as much as digits as its factorization.

68411809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 68411809 is about 8271.1431495290. The cubic root of 68411809 is about 408.9878045873.

The spelling of 68411809 in words is "sixty-eight million, four hundred eleven thousand, eight hundred nine".