249938963809 has 2 divisors, whose sum is σ = 249938963810. Its totient is φ = 249938963808.

The previous prime is 249938963803. The next prime is 249938963821. The reversal of 249938963809 is 908369839942.

249938963809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 238129360225 + 11809603584 = 487985^2 + 108672^2 .

It is a cyclic number.

It is not a de Polignac number, because 249938963809 - 2²¹ = 249936866657 is a prime.

It is a super-2 number, since 2×249938963809² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (249938963803) 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, 124969481904 + 124969481905.

It is an arithmetic number, because the mean of its divisors is an integer number (124969481905).

Almost surely, 2^249938963809 is an apocalyptic number.

It is an amenable number.

249938963809 is a deficient number, since it is larger than the sum of its proper divisors (1).

249938963809 is an equidigital number, since it uses as much as digits as its factorization.

249938963809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181398528, while the sum is 70.

The spelling of 249938963809 in words is "two hundred forty-nine billion, nine hundred thirty-eight million, nine hundred sixty-three thousand, eight hundred nine".