109519981 has 2 divisors, whose sum is σ = 109519982. Its totient is φ = 109519980.

The previous prime is 109519919. The next prime is 109520027. The reversal of 109519981 is 189915901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97199881 + 12320100 = 9859^2 + 3510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109519981 is a prime.

It is a super-2 number, since 2×109519981² = 23989252476480722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109519901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54759990 + 54759991.

It is an arithmetic number, because the mean of its divisors is an integer number (54759991).

Almost surely, 2^109519981 is an apocalyptic number.

It is an amenable number.

109519981 is a deficient number, since it is larger than the sum of its proper divisors (1).

109519981 is an equidigital number, since it uses as much as digits as its factorization.

109519981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29160, while the sum is 43.

The square root of 109519981 is about 10465.1794537886. The cubic root of 109519981 is about 478.4440080548. Note that the first 3 decimals are identical.

The spelling of 109519981 in words is "one hundred nine million, five hundred nineteen thousand, nine hundred eighty-one".