249899999 has 2 divisors, whose sum is σ = 249900000. Its totient is φ = 249899998.

The previous prime is 249899953. The next prime is 249900011. The reversal of 249899999 is 999998942.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 249899999 - 2⁸ = 249899743 is a prime.

It is a Chen prime.

249899999 is a modest number, since divided by 99999 gives 2498 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249899599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124949999 + 124950000.

It is an arithmetic number, because the mean of its divisors is an integer number (124950000).

Almost surely, 2^249899999 is an apocalyptic number.

249899999 is a deficient number, since it is larger than the sum of its proper divisors (1).

249899999 is an equidigital number, since it uses as much as digits as its factorization.

249899999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34012224, while the sum is 68.

The square root of 249899999 is about 15808.2256752616. The cubic root of 249899999 is about 629.8765181688.

The spelling of 249899999 in words is "two hundred forty-nine million, eight hundred ninety-nine thousand, nine hundred ninety-nine".