68607521 has 2 divisors, whose sum is σ = 68607522. Its totient is φ = 68607520.

The previous prime is 68607503. The next prime is 68607523. The reversal of 68607521 is 12570686.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 42393121 + 26214400 = 6511^2 + 5120^2 .

It is a cyclic number.

It is not a de Polignac number, because 68607521 - 2¹⁰ = 68606497 is a prime.

Together with 68607523, 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 (68607523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34303760 + 34303761.

It is an arithmetic number, because the mean of its divisors is an integer number (34303761).

Almost surely, 2^68607521 is an apocalyptic number.

It is an amenable number.

68607521 is a deficient number, since it is larger than the sum of its proper divisors (1).

68607521 is an equidigital number, since it uses as much as digits as its factorization.

68607521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 68607521 is about 8282.9657128350. The cubic root of 68607521 is about 409.3774430326.

The spelling of 68607521 in words is "sixty-eight million, six hundred seven thousand, five hundred twenty-one".