68814821 has 2 divisors, whose sum is σ = 68814822. Its totient is φ = 68814820.

The previous prime is 68814799. The next prime is 68814841. The reversal of 68814821 is 12841886.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61058596 + 7756225 = 7814^2 + 2785^2 .

It is a cyclic number.

It is not a de Polignac number, because 68814821 - 2¹⁴ = 68798437 is a prime.

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 (68814841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34407410 + 34407411.

It is an arithmetic number, because the mean of its divisors is an integer number (34407411).

Almost surely, 2^68814821 is an apocalyptic number.

It is an amenable number.

68814821 is a deficient number, since it is larger than the sum of its proper divisors (1).

68814821 is an equidigital number, since it uses as much as digits as its factorization.

68814821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24576, while the sum is 38.

The square root of 68814821 is about 8295.4699083295. The cubic root of 68814821 is about 409.7893444917.

The spelling of 68814821 in words is "sixty-eight million, eight hundred fourteen thousand, eight hundred twenty-one".