68281529 has 2 divisors, whose sum is σ = 68281530. Its totient is φ = 68281528.

The previous prime is 68281513. The next prime is 68281531. The reversal of 68281529 is 92518286.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40960000 + 27321529 = 6400^2 + 5227^2 .

It is a cyclic number.

It is not a de Polignac number, because 68281529 - 2⁴ = 68281513 is a prime.

Together with 68281531, 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 (68281229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34140764 + 34140765.

It is an arithmetic number, because the mean of its divisors is an integer number (34140765).

Almost surely, 2^68281529 is an apocalyptic number.

It is an amenable number.

68281529 is a deficient number, since it is larger than the sum of its proper divisors (1).

68281529 is an equidigital number, since it uses as much as digits as its factorization.

68281529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 41.

The square root of 68281529 is about 8263.2638224856. The cubic root of 68281529 is about 408.7280210261.

The spelling of 68281529 in words is "sixty-eight million, two hundred eighty-one thousand, five hundred twenty-nine".