250105 has 4 divisors (see below), whose sum is σ = 300132. Its totient is φ = 200080.

The previous prime is 250091. The next prime is 250109. The reversal of 250105 is 501052.

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 131769 + 118336 = 363^2 + 344^2 .

It is not a de Polignac number, because 250105 - 2⁵ = 250073 is a prime.

It is a super-2 number, since 2×250105² = 125105022050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (250109) 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, 25006 + ... + 25015.

It is an arithmetic number, because the mean of its divisors is an integer number (75033).

250105 is a Friedman number, since it can be written as 50021*5, using all its digits and the basic arithmetic operations.

2²⁵⁰¹⁰⁵ is an apocalyptic number.

It is an amenable number.

250105 is a deficient number, since it is larger than the sum of its proper divisors (50027).

250105 is an equidigital number, since it uses as much as digits as its factorization.

250105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50026.

The product of its (nonzero) digits is 50, while the sum is 13.

The square root of 250105 is about 500.1049889773. The cubic root of 250105 is about 63.0048707077.

Adding to 250105 its reverse (501052), we get a palindrome (751157).

The spelling of 250105 in words is "two hundred fifty thousand, one hundred five".