108331981 has 2 divisors, whose sum is σ = 108331982. Its totient is φ = 108331980.

The previous prime is 108331943. The next prime is 108331987. The reversal of 108331981 is 189133801.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105390756 + 2941225 = 10266^2 + 1715^2 .

It is a cyclic number.

It is not a de Polignac number, because 108331981 - 2⁹ = 108331469 is a prime.

It is a super-2 number, since 2×108331981² = 23471636214768722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (108331987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54165990 + 54165991.

It is an arithmetic number, because the mean of its divisors is an integer number (54165991).

Almost surely, 2^108331981 is an apocalyptic number.

It is an amenable number.

108331981 is a deficient number, since it is larger than the sum of its proper divisors (1).

108331981 is an equidigital number, since it uses as much as digits as its factorization.

108331981 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 34.

The square root of 108331981 is about 10408.2650331359. The cubic root of 108331981 is about 476.7077673875.

The spelling of 108331981 in words is "one hundred eight million, three hundred thirty-one thousand, nine hundred eighty-one".