68521 has 2 divisors, whose sum is σ = 68522. Its totient is φ = 68520.

The previous prime is 68507. The next prime is 68531. The reversal of 68521 is 12586.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68121 + 400 = 261^2 + 20^2 .

It is a cyclic number.

It is not a de Polignac number, because 68521 - 2⁵ = 68489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 68492 and 68501.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34260 + 34261.

It is an arithmetic number, because the mean of its divisors is an integer number (34261).

2⁶⁸⁵²¹ is an apocalyptic number.

It is an amenable number.

68521 is a deficient number, since it is larger than the sum of its proper divisors (1).

68521 is an equidigital number, since it uses as much as digits as its factorization.

68521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 480, while the sum is 22.

The square root of 68521 is about 261.7651619295. The cubic root of 68521 is about 40.9205281900.

The spelling of 68521 in words is "sixty-eight thousand, five hundred twenty-one".