105209789 has 4 divisors (see below), whose sum is σ = 106294524. Its totient is φ = 104125056.

The previous prime is 105209779. The next prime is 105209809. The reversal of 105209789 is 987902501.

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 30525625 + 74684164 = 5525^2 + 8642^2 .

It is a cyclic number.

It is not a de Polignac number, because 105209789 - 2⁴ = 105209773 is a prime.

It is a super-2 number, since 2×105209789² = 22138199402849042, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105209729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 542222 + ... + 542415.

It is an arithmetic number, because the mean of its divisors is an integer number (26573631).

Almost surely, 2^105209789 is an apocalyptic number.

It is an amenable number.

105209789 is a deficient number, since it is larger than the sum of its proper divisors (1084735).

105209789 is an equidigital number, since it uses as much as digits as its factorization.

105209789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084734.

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 105209789 is about 10257.1823128967. The cubic root of 105209789 is about 472.0833859309.

The spelling of 105209789 in words is "one hundred five million, two hundred nine thousand, seven hundred eighty-nine".