68317521 has 48 divisors (see below), whose sum is σ = 105861120. Its totient is φ = 38966400.

The previous prime is 68317507. The next prime is 68317537. The reversal of 68317521 is 12571386.

It is not a de Polignac number, because 68317521 - 2⁵ = 68317489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68317121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1666261 + ... + 1666301.

It is an arithmetic number, because the mean of its divisors is an integer number (2205440).

Almost surely, 2^68317521 is an apocalyptic number.

It is an amenable number.

68317521 is a deficient number, since it is larger than the sum of its proper divisors (37543599).

68317521 is a wasteful number, since it uses less digits than its factorization.

68317521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 117 counting only the distinct ones).

The product of its digits is 10080, while the sum is 33.

The square root of 68317521 is about 8265.4413675254. The cubic root of 68317521 is about 408.7998235332.

The spelling of 68317521 in words is "sixty-eight million, three hundred seventeen thousand, five hundred twenty-one".