105800249 has 4 divisors (see below), whose sum is σ = 106161636. Its totient is φ = 105438864.

The previous prime is 105800237. The next prime is 105800257. The reversal of 105800249 is 942008501.

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 81721600 + 24078649 = 9040^2 + 4907^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105800249 is a prime.

It is a super-2 number, since 2×105800249² = 22387385376924002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (105800269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180254 + ... + 180839.

It is an arithmetic number, because the mean of its divisors is an integer number (26540409).

Almost surely, 2^105800249 is an apocalyptic number.

It is an amenable number.

105800249 is a deficient number, since it is larger than the sum of its proper divisors (361387).

105800249 is an equidigital number, since it uses as much as digits as its factorization.

105800249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361386.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 105800249 is about 10285.9248004251. The cubic root of 105800249 is about 472.9648834828.

The spelling of 105800249 in words is "one hundred five million, eight hundred thousand, two hundred forty-nine".