68753521 has 2 divisors, whose sum is σ = 68753522. Its totient is φ = 68753520.

The previous prime is 68753507. The next prime is 68753537. The reversal of 68753521 is 12535786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51322896 + 17430625 = 7164^2 + 4175^2 .

It is a cyclic number.

It is not a de Polignac number, because 68753521 - 2¹³ = 68745329 is a prime.

It is a super-3 number, since 3×68753521³ (a number of 24 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68753021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34376760 + 34376761.

It is an arithmetic number, because the mean of its divisors is an integer number (34376761).

Almost surely, 2^68753521 is an apocalyptic number.

It is an amenable number.

68753521 is a deficient number, since it is larger than the sum of its proper divisors (1).

68753521 is an equidigital number, since it uses as much as digits as its factorization.

68753521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 37.

The square root of 68753521 is about 8291.7742974589. The cubic root of 68753521 is about 409.6676287087.

The spelling of 68753521 in words is "sixty-eight million, seven hundred fifty-three thousand, five hundred twenty-one".