105147809 has 4 divisors (see below), whose sum is σ = 113236116. Its totient is φ = 97059504.

The previous prime is 105147799. The next prime is 105147827. The reversal of 105147809 is 908741501.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 908741501 = 4817 ⋅188653.

It can be written as a sum of positive squares in 2 ways, for example, as 60217600 + 44930209 = 7760^2 + 6703^2 .

It is a cyclic number.

It is not a de Polignac number, because 105147809 - 2¹⁶ = 105082273 is a prime.

It is a super-2 number, since 2×105147809² = 22112123475000962, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (105147829) 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, 4044134 + ... + 4044159.

It is an arithmetic number, because the mean of its divisors is an integer number (28309029).

Almost surely, 2^105147809 is an apocalyptic number.

It is an amenable number.

105147809 is a deficient number, since it is larger than the sum of its proper divisors (8088307).

105147809 is an equidigital number, since it uses as much as digits as its factorization.

105147809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8088306.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 105147809 is about 10254.1605702271. The cubic root of 105147809 is about 471.9906649140.

The spelling of 105147809 in words is "one hundred five million, one hundred forty-seven thousand, eight hundred nine".