106809581 has 4 divisors (see below), whose sum is σ = 110492700. Its totient is φ = 103126464.

The previous prime is 106809569. The next prime is 106809587. The reversal of 106809581 is 185908601.

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 68740681 + 38068900 = 8291^2 + 6170^2 .

It is a cyclic number.

It is not a de Polignac number, because 106809581 - 2⁶ = 106809517 is a prime.

It is a super-2 number, since 2×106809581² = 22816573186791122, 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 (106809587) 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, 1841516 + ... + 1841573.

It is an arithmetic number, because the mean of its divisors is an integer number (27623175).

Almost surely, 2^106809581 is an apocalyptic number.

It is an amenable number.

106809581 is a deficient number, since it is larger than the sum of its proper divisors (3683119).

106809581 is an equidigital number, since it uses as much as digits as its factorization.

106809581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3683118.

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

The square root of 106809581 is about 10334.8720843560. The cubic root of 106809581 is about 474.4641506736.

The spelling of 106809581 in words is "one hundred six million, eight hundred nine thousand, five hundred eighty-one".