108910981 has 2 divisors, whose sum is σ = 108910982. Its totient is φ = 108910980.

The previous prime is 108910969. The next prime is 108911039. The reversal of 108910981 is 189019801.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78605956 + 30305025 = 8866^2 + 5505^2 .

It is a cyclic number.

It is not a de Polignac number, because 108910981 - 2⁷ = 108910853 is a prime.

It is a super-2 number, since 2×108910981² = 23723203564764722, 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 108910981.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (108910931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54455490 + 54455491.

It is an arithmetic number, because the mean of its divisors is an integer number (54455491).

Almost surely, 2^108910981 is an apocalyptic number.

It is an amenable number.

108910981 is a deficient number, since it is larger than the sum of its proper divisors (1).

108910981 is an equidigital number, since it uses as much as digits as its factorization.

108910981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 37.

The square root of 108910981 is about 10436.0424012170. The cubic root of 108910981 is about 477.5555426377. Note that the first 4 decimals are identical.

The spelling of 108910981 in words is "one hundred eight million, nine hundred ten thousand, nine hundred eighty-one".