109955981 has 4 divisors (see below), whose sum is σ = 110353212. Its totient is φ = 109558752.

The previous prime is 109955959. The next prime is 109955987. The reversal of 109955981 is 189559901.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 189559901 = 197 ⋅962233.

It can be written as a sum of positive squares in 2 ways, for example, as 5221225 + 104734756 = 2285^2 + 10234^2 .

It is a cyclic number.

It is not a de Polignac number, because 109955981 - 2⁶ = 109955917 is a prime.

It is a super-2 number, since 2×109955981² = 24180635515344722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109955987) 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, 198200 + ... + 198753.

It is an arithmetic number, because the mean of its divisors is an integer number (27588303).

Almost surely, 2^109955981 is an apocalyptic number.

It is an amenable number.

109955981 is a deficient number, since it is larger than the sum of its proper divisors (397231).

109955981 is an equidigital number, since it uses as much as digits as its factorization.

109955981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397230.

The product of its (nonzero) digits is 145800, while the sum is 47.

The square root of 109955981 is about 10485.9897482307. The cubic root of 109955981 is about 479.0780639939.

The spelling of 109955981 in words is "one hundred nine million, nine hundred fifty-five thousand, nine hundred eighty-one".