249641 has 8 divisors (see below), whose sum is σ = 300480. Its totient is φ = 202608.

The previous prime is 249607. The next prime is 249647. The reversal of 249641 is 146942.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-249641 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 249641.

It is not an unprimeable number, because it can be changed into a prime (249647) 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 7 ways as a sum of consecutive naturals, for example, 806 + ... + 1071.

It is an arithmetic number, because the mean of its divisors is an integer number (37560).

2²⁴⁹⁶⁴¹ is an apocalyptic number.

It is an amenable number.

249641 is a deficient number, since it is larger than the sum of its proper divisors (50839).

249641 is a wasteful number, since it uses less digits than its factorization.

249641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1903.

The product of its digits is 1728, while the sum is 26.

The square root of 249641 is about 499.6408710264. The cubic root of 249641 is about 62.9658839390.

The spelling of 249641 in words is "two hundred forty-nine thousand, six hundred forty-one".