68617421 has 2 divisors, whose sum is σ = 68617422. Its totient is φ = 68617420.

The previous prime is 68617403. The next prime is 68617427. The reversal of 68617421 is 12471686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64561225 + 4056196 = 8035^2 + 2014^2 .

It is a cyclic number.

It is not a de Polignac number, because 68617421 - 2¹⁸ = 68355277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68617427) 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, 34308710 + 34308711.

It is an arithmetic number, because the mean of its divisors is an integer number (34308711).

Almost surely, 2^68617421 is an apocalyptic number.

It is an amenable number.

68617421 is a deficient number, since it is larger than the sum of its proper divisors (1).

68617421 is an equidigital number, since it uses as much as digits as its factorization.

68617421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 35.

The square root of 68617421 is about 8283.5633033134. The cubic root of 68617421 is about 409.3971330108.

The spelling of 68617421 in words is "sixty-eight million, six hundred seventeen thousand, four hundred twenty-one".