68945621 has 2 divisors, whose sum is σ = 68945622. Its totient is φ = 68945620.

The previous prime is 68945603. The next prime is 68945627. The reversal of 68945621 is 12654986.

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., 46430596 + 22515025 = 6814^2 + 4745^2 .

It is a cyclic number.

It is not a de Polignac number, because 68945621 - 2¹⁸ = 68683477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68945627) 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, 34472810 + 34472811.

It is an arithmetic number, because the mean of its divisors is an integer number (34472811).

Almost surely, 2^68945621 is an apocalyptic number.

It is an amenable number.

68945621 is a deficient number, since it is larger than the sum of its proper divisors (1).

68945621 is an equidigital number, since it uses as much as digits as its factorization.

68945621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 41.

The square root of 68945621 is about 8303.3499866018. The cubic root of 68945621 is about 410.0488163172.

The spelling of 68945621 in words is "sixty-eight million, nine hundred forty-five thousand, six hundred twenty-one".