68236381 has 2 divisors, whose sum is σ = 68236382. Its totient is φ = 68236380.

The previous prime is 68236379. The next prime is 68236393. The reversal of 68236381 is 18363286.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60062500 + 8173881 = 7750^2 + 2859^2 .

It is a cyclic number.

It is not a de Polignac number, because 68236381 - 2¹ = 68236379 is a prime.

It is a super-2 number, since 2×68236381² = 9312407383954322, which contains 22 as substring.

Together with 68236379, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 68236381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68236321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34118190 + 34118191.

It is an arithmetic number, because the mean of its divisors is an integer number (34118191).

Almost surely, 2^68236381 is an apocalyptic number.

It is an amenable number.

68236381 is a deficient number, since it is larger than the sum of its proper divisors (1).

68236381 is an equidigital number, since it uses as much as digits as its factorization.

68236381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 41472, while the sum is 37.

The square root of 68236381 is about 8260.5315204289. The cubic root of 68236381 is about 408.6379170034.

It can be divided in two parts, 682 and 36381, that multiplied together give a palindrome (24811842).

The spelling of 68236381 in words is "sixty-eight million, two hundred thirty-six thousand, three hundred eighty-one".