249121 has 4 divisors (see below), whose sum is σ = 255892. Its totient is φ = 242352.

The previous prime is 249107. The next prime is 249127. The reversal of 249121 is 121942.

249121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 239121 + 10000 = 489^2 + 100^2 .

It is a cyclic number.

It is not a de Polignac number, because 249121 - 2⁵ = 249089 is a prime.

It is a super-2 number, since 2×249121² = 124122545282, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (249127) 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, 3330 + ... + 3403.

It is an arithmetic number, because the mean of its divisors is an integer number (63973).

2²⁴⁹¹²¹ is an apocalyptic number.

It is an amenable number.

249121 is a deficient number, since it is larger than the sum of its proper divisors (6771).

249121 is an equidigital number, since it uses as much as digits as its factorization.

249121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6770.

The product of its digits is 144, while the sum is 19.

The square root of 249121 is about 499.1202259977. The cubic root of 249121 is about 62.9221344214.

The spelling of 249121 in words is "two hundred forty-nine thousand, one hundred twenty-one".