249851384609 has 2 divisors, whose sum is σ = 249851384610. Its totient is φ = 249851384608.

The previous prime is 249851384579. The next prime is 249851384647. The reversal of 249851384609 is 906483158942.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 237781066384 + 12070318225 = 487628^2 + 109865^2 .

It is a cyclic number.

It is not a de Polignac number, because 249851384609 - 2²⁸ = 249582949153 is a prime.

It is not a weakly prime, because it can be changed into another prime (249851384309) 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 as a sum of consecutive naturals, namely, 124925692304 + 124925692305.

It is an arithmetic number, because the mean of its divisors is an integer number (124925692305).

Almost surely, 2^249851384609 is an apocalyptic number.

It is an amenable number.

249851384609 is a deficient number, since it is larger than the sum of its proper divisors (1).

249851384609 is an equidigital number, since it uses as much as digits as its factorization.

249851384609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14929920, while the sum is 59.

The spelling of 249851384609 in words is "two hundred forty-nine billion, eight hundred fifty-one million, three hundred eighty-four thousand, six hundred nine".