108936781 has 2 divisors, whose sum is σ = 108936782. Its totient is φ = 108936780.

The previous prime is 108936767. The next prime is 108936797. The reversal of 108936781 is 187639801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 102515625 + 6421156 = 10125^2 + 2534^2 .

It is a cyclic number.

It is not a de Polignac number, because 108936781 - 2⁵ = 108936749 is a prime.

It is a super-2 number, since 2×108936781² = 23734444509283922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (108936721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54468390 + 54468391.

It is an arithmetic number, because the mean of its divisors is an integer number (54468391).

Almost surely, 2^108936781 is an apocalyptic number.

It is an amenable number.

108936781 is a deficient number, since it is larger than the sum of its proper divisors (1).

108936781 is an equidigital number, since it uses as much as digits as its factorization.

108936781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 108936781 is about 10437.2784287859. The cubic root of 108936781 is about 477.5932491515.

The spelling of 108936781 in words is "one hundred eight million, nine hundred thirty-six thousand, seven hundred eighty-one".