249988851 has 12 divisors (see below), whose sum is σ = 412680112. Its totient is φ = 142850736.

The previous prime is 249988829. The next prime is 249988861. The reversal of 249988851 is 158889942.

It is not a de Polignac number, because 249988851 - 2⁵ = 249988819 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (249988811) 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 11 ways as a sum of consecutive naturals, for example, 1983976 + ... + 1984101.

Almost surely, 2^249988851 is an apocalyptic number.

249988851 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

249988851 is a deficient number, since it is larger than the sum of its proper divisors (162691261).

249988851 is a wasteful number, since it uses less digits than its factorization.

249988851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3968090 (or 3968087 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 54.

The square root of 249988851 is about 15811.0357345748. The cubic root of 249988851 is about 629.9511602350.

The spelling of 249988851 in words is "two hundred forty-nine million, nine hundred eighty-eight thousand, eight hundred fifty-one".