108943781 has 4 divisors (see below), whose sum is σ = 109013100. Its totient is φ = 108874464.

The previous prime is 108943741. The next prime is 108943787. The reversal of 108943781 is 187349801.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54316900 + 54626881 = 7370^2 + 7391^2 .

It is a cyclic number.

It is not a de Polignac number, because 108943781 - 2⁶ = 108943717 is a prime.

It is a super-2 number, since 2×108943781² = 23737494837151922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (108943787) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32246 + ... + 35463.

It is an arithmetic number, because the mean of its divisors is an integer number (27253275).

Almost surely, 2^108943781 is an apocalyptic number.

It is an amenable number.

108943781 is a deficient number, since it is larger than the sum of its proper divisors (69319).

108943781 is an equidigital number, since it uses as much as digits as its factorization.

108943781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69318.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 108943781 is about 10437.6137598591. The cubic root of 108943781 is about 477.6034785742.

The spelling of 108943781 in words is "one hundred eight million, nine hundred forty-three thousand, seven hundred eighty-one".