249599243 has 4 divisors (see below), whose sum is σ = 260451408. Its totient is φ = 238747080.

The previous prime is 249599239. The next prime is 249599249. The reversal of 249599243 is 342995942.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 249599243 - 2² = 249599239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249599249) 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, 5426048 + ... + 5426093.

It is an arithmetic number, because the mean of its divisors is an integer number (65112852).

Almost surely, 2^249599243 is an apocalyptic number.

249599243 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

249599243 is a deficient number, since it is larger than the sum of its proper divisors (10852165).

249599243 is a wasteful number, since it uses less digits than its factorization.

249599243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10852164.

The product of its digits is 699840, while the sum is 47.

The square root of 249599243 is about 15798.7101688714. The cubic root of 249599243 is about 629.6237301326.

The spelling of 249599243 in words is "two hundred forty-nine million, five hundred ninety-nine thousand, two hundred forty-three".