68409961 has 2 divisors, whose sum is σ = 68409962. Its totient is φ = 68409960.

The previous prime is 68409953. The next prime is 68409967. The reversal of 68409961 is 16990486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42968025 + 25441936 = 6555^2 + 5044^2 .

It is a cyclic number.

It is not a de Polignac number, because 68409961 - 2³ = 68409953 is a prime.

It is not a weakly prime, because it can be changed into another prime (68409967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34204980 + 34204981.

It is an arithmetic number, because the mean of its divisors is an integer number (34204981).

Almost surely, 2^68409961 is an apocalyptic number.

It is an amenable number.

68409961 is a deficient number, since it is larger than the sum of its proper divisors (1).

68409961 is an equidigital number, since it uses as much as digits as its factorization.

68409961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 68409961 is about 8271.0314350751. The cubic root of 68409961 is about 408.9841219080.

The spelling of 68409961 in words is "sixty-eight million, four hundred nine thousand, nine hundred sixty-one".