249112809 has 24 divisors (see below), whose sum is σ = 399204000. Its totient is φ = 148415040.

The previous prime is 249112789. The next prime is 249112847. The reversal of 249112809 is 908211942.

It is not a de Polignac number, because 249112809 - 2¹⁹ = 248588521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (249112309) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15484 + ... + 27165.

It is an arithmetic number, because the mean of its divisors is an integer number (16633500).

Almost surely, 2^249112809 is an apocalyptic number.

It is an amenable number.

249112809 is a deficient number, since it is larger than the sum of its proper divisors (150091191).

249112809 is a wasteful number, since it uses less digits than its factorization.

249112809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42725 (or 42722 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 249112809 is about 15783.3079232460. The cubic root of 249112809 is about 629.2144479557.

The spelling of 249112809 in words is "two hundred forty-nine million, one hundred twelve thousand, eight hundred nine".