249808899 has 4 divisors (see below), whose sum is σ = 333078536. Its totient is φ = 166539264.

The previous prime is 249808861. The next prime is 249808907. The reversal of 249808899 is 998808942.

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

It is not a de Polignac number, because 249808899 - 2¹⁶ = 249743363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249808099) 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, 41634814 + ... + 41634819.

It is an arithmetic number, because the mean of its divisors is an integer number (83269634).

Almost surely, 2^249808899 is an apocalyptic number.

249808899 is a deficient number, since it is larger than the sum of its proper divisors (83269637).

249808899 is an equidigital number, since it uses as much as digits as its factorization.

249808899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83269636.

The product of its (nonzero) digits is 2985984, while the sum is 57.

The square root of 249808899 is about 15805.3440013180. The cubic root of 249808899 is about 629.7999692490.

The spelling of 249808899 in words is "two hundred forty-nine million, eight hundred eight thousand, eight hundred ninety-nine".