68211081 has 9 divisors (see below), whose sum is σ = 98562919. Its totient is φ = 45457536.

The previous prime is 68211071. The next prime is 68211097. The reversal of 68211081 is 18011286.

The square root of 68211081 is 8259.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 63441225 + 4769856 = 7965^2 + 2184^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 68211081 - 2¹⁷ = 68080009 is a prime.

It is a super-3 number, since 3×68211081³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68211061) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 23401 + ... + 26153.

Almost surely, 2^68211081 is an apocalyptic number.

68211081 is the 8259-th square number.

68211081 is the 4130-th centered octagonal number.

It is an amenable number.

68211081 is a deficient number, since it is larger than the sum of its proper divisors (30351838).

68211081 is an frugal number, since it uses more digits than its factorization.

68211081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5512 (or 2756 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The cubic root of 68211081 is about 408.5874072062.

The spelling of 68211081 in words is "sixty-eight million, two hundred eleven thousand, eighty-one".