68631481 has 2 divisors, whose sum is σ = 68631482. Its totient is φ = 68631480.

The previous prime is 68631473. The next prime is 68631491. The reversal of 68631481 is 18413686.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53421481 + 15210000 = 7309^2 + 3900^2 .

It is a cyclic number.

It is not a de Polignac number, because 68631481 - 2³ = 68631473 is a prime.

It is a super-2 number, since 2×68631481² = 9420560368506722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 68631481.

It is not a weakly prime, because it can be changed into another prime (68631491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34315740 + 34315741.

It is an arithmetic number, because the mean of its divisors is an integer number (34315741).

Almost surely, 2^68631481 is an apocalyptic number.

It is an amenable number.

68631481 is a deficient number, since it is larger than the sum of its proper divisors (1).

68631481 is an equidigital number, since it uses as much as digits as its factorization.

68631481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27648, while the sum is 37.

The square root of 68631481 is about 8284.4119284352. The cubic root of 68631481 is about 409.4250935029.

The spelling of 68631481 in words is "sixty-eight million, six hundred thirty-one thousand, four hundred eighty-one".