68378521 has 2 divisors, whose sum is σ = 68378522. Its totient is φ = 68378520.

The previous prime is 68378509. The next prime is 68378593. The reversal of 68378521 is 12587386.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66585600 + 1792921 = 8160^2 + 1339^2 .

It is a cyclic number.

It is not a de Polignac number, because 68378521 - 2⁵ = 68378489 is a prime.

It is not a weakly prime, because it can be changed into another prime (68378021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34189260 + 34189261.

It is an arithmetic number, because the mean of its divisors is an integer number (34189261).

Almost surely, 2^68378521 is an apocalyptic number.

It is an amenable number.

68378521 is a deficient number, since it is larger than the sum of its proper divisors (1).

68378521 is an equidigital number, since it uses as much as digits as its factorization.

68378521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 40.

The square root of 68378521 is about 8269.1306072646. The cubic root of 68378521 is about 408.9214583672.

The spelling of 68378521 in words is "sixty-eight million, three hundred seventy-eight thousand, five hundred twenty-one".