109806581 has 4 divisors (see below), whose sum is σ = 110153292. Its totient is φ = 109459872.

The previous prime is 109806559. The next prime is 109806583. The reversal of 109806581 is 185608901.

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 11122225 + 98684356 = 3335^2 + 9934^2 .

It is a cyclic number.

It is not a de Polignac number, because 109806581 - 2⁶ = 109806517 is a prime.

It is a super-2 number, since 2×109806581² = 24114970461819122, 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 (109806583) 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, 172880 + ... + 173513.

It is an arithmetic number, because the mean of its divisors is an integer number (27538323).

Almost surely, 2^109806581 is an apocalyptic number.

It is an amenable number.

109806581 is a deficient number, since it is larger than the sum of its proper divisors (346711).

109806581 is an equidigital number, since it uses as much as digits as its factorization.

109806581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346710.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 109806581 is about 10478.8635357084. The cubic root of 109806581 is about 478.8609871140.

The spelling of 109806581 in words is "one hundred nine million, eight hundred six thousand, five hundred eighty-one".