68748521 has 2 divisors, whose sum is σ = 68748522. Its totient is φ = 68748520.

The previous prime is 68748487. The next prime is 68748523. The reversal of 68748521 is 12584786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57592921 + 11155600 = 7589^2 + 3340^2 .

It is a cyclic number.

It is not a de Polignac number, because 68748521 - 2⁶ = 68748457 is a prime.

Together with 68748523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68748523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34374260 + 34374261.

It is an arithmetic number, because the mean of its divisors is an integer number (34374261).

Almost surely, 2^68748521 is an apocalyptic number.

It is an amenable number.

68748521 is a deficient number, since it is larger than the sum of its proper divisors (1).

68748521 is an equidigital number, since it uses as much as digits as its factorization.

68748521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107520, while the sum is 41.

The square root of 68748521 is about 8291.4727883531. The cubic root of 68748521 is about 409.6576976401.

The spelling of 68748521 in words is "sixty-eight million, seven hundred forty-eight thousand, five hundred twenty-one".