68744521 has 2 divisors, whose sum is σ = 68744522. Its totient is φ = 68744520.

The previous prime is 68744513. The next prime is 68744531. The reversal of 68744521 is 12544786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67815225 + 929296 = 8235^2 + 964^2 .

It is a cyclic number.

It is not a de Polignac number, because 68744521 - 2³ = 68744513 is a prime.

It is not a weakly prime, because it can be changed into another prime (68744531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34372260 + 34372261.

It is an arithmetic number, because the mean of its divisors is an integer number (34372261).

Almost surely, 2^68744521 is an apocalyptic number.

It is an amenable number.

68744521 is a deficient number, since it is larger than the sum of its proper divisors (1).

68744521 is an equidigital number, since it uses as much as digits as its factorization.

68744521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 37.

The square root of 68744521 is about 8291.2315731742. The cubic root of 68744521 is about 409.6497524385.

The spelling of 68744521 in words is "sixty-eight million, seven hundred forty-four thousand, five hundred twenty-one".