249880009 has 4 divisors (see below), whose sum is σ = 255691216. Its totient is φ = 244068804.

The previous prime is 249879983. The next prime is 249880013. The reversal of 249880009 is 900088942.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 900088942 = 2 ⋅450044471.

It is a cyclic number.

It is not a de Polignac number, because 249880009 - 2⁵ = 249879977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249880019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2905539 + ... + 2905624.

It is an arithmetic number, because the mean of its divisors is an integer number (63922804).

Almost surely, 2^249880009 is an apocalyptic number.

It is an amenable number.

249880009 is a deficient number, since it is larger than the sum of its proper divisors (5811207).

249880009 is an equidigital number, since it uses as much as digits as its factorization.

249880009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5811206.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 249880009 is about 15807.5933968457. The cubic root of 249880009 is about 629.8597226941.

The spelling of 249880009 in words is "two hundred forty-nine million, eight hundred eighty thousand, nine".