105269809 has 4 divisors (see below), whose sum is σ = 105390180. Its totient is φ = 105149440.

The previous prime is 105269803. The next prime is 105269821. The reversal of 105269809 is 908962501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 908962501 = 31 ⋅29321371.

It can be written as a sum of positive squares in 2 ways, for example, as 18835600 + 86434209 = 4340^2 + 9297^2 .

It is a cyclic number.

It is not a de Polignac number, because 105269809 - 2⁵ = 105269777 is a prime.

It is a super-2 number, since 2×105269809² = 22163465373792962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105269803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58864 + ... + 60625.

It is an arithmetic number, because the mean of its divisors is an integer number (26347545).

Almost surely, 2^105269809 is an apocalyptic number.

It is an amenable number.

105269809 is a deficient number, since it is larger than the sum of its proper divisors (120371).

105269809 is an equidigital number, since it uses as much as digits as its factorization.

105269809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120370.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 105269809 is about 10260.1076505074. The cubic root of 105269809 is about 472.1731401218.

The spelling of 105269809 in words is "one hundred five million, two hundred sixty-nine thousand, eight hundred nine".