249750019 has 2 divisors, whose sum is σ = 249750020. Its totient is φ = 249750018.

The previous prime is 249749989. The next prime is 249750089. The reversal of 249750019 is 910057942.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 249750019 - 2²³ = 241361411 is a prime.

It is a super-2 number, since 2×249750019² = 124750143981000722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 249750019.

It is not a weakly prime, because it can be changed into another prime (249750089) 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 as a sum of consecutive naturals, namely, 124875009 + 124875010.

It is an arithmetic number, because the mean of its divisors is an integer number (124875010).

Almost surely, 2^249750019 is an apocalyptic number.

249750019 is a deficient number, since it is larger than the sum of its proper divisors (1).

249750019 is an equidigital number, since it uses as much as digits as its factorization.

249750019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 37.

The square root of 249750019 is about 15803.4812304125. The cubic root of 249750019 is about 629.7504840409.

The spelling of 249750019 in words is "two hundred forty-nine million, seven hundred fifty thousand, nineteen".