249091 has 4 divisors (see below), whose sum is σ = 250432. Its totient is φ = 247752.

The previous prime is 249089. The next prime is 249097. The reversal of 249091 is 190942.

249091 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, and also an emirpimes, since its reverse is a distinct semiprime: 190942 = 2 ⋅95471.

It is a cyclic number.

It is not a de Polignac number, because 249091 - 2¹ = 249089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249097) 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, 336 + ... + 781.

It is an arithmetic number, because the mean of its divisors is an integer number (62608).

2²⁴⁹⁰⁹¹ is an apocalyptic number.

249091 is a deficient number, since it is larger than the sum of its proper divisors (1341).

249091 is a wasteful number, since it uses less digits than its factorization.

249091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 249091 is about 499.0901722134. The cubic root of 249091 is about 62.9196085541.

The spelling of 249091 in words is "two hundred forty-nine thousand, ninety-one".