243249949 has 2 divisors, whose sum is σ = 243249950. Its totient is φ = 243249948.

The previous prime is 243249917. The next prime is 243250013. The reversal of 243249949 is 949942342.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161925625 + 81324324 = 12725^2 + 9018^2 .

It is a cyclic number.

It is not a de Polignac number, because 243249949 - 2⁵ = 243249917 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243249899 and 243249908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243229949) 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, 121624974 + 121624975.

It is an arithmetic number, because the mean of its divisors is an integer number (121624975).

Almost surely, 2^243249949 is an apocalyptic number.

It is an amenable number.

243249949 is a deficient number, since it is larger than the sum of its proper divisors (1).

243249949 is an equidigital number, since it uses as much as digits as its factorization.

243249949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 559872, while the sum is 46.

The square root of 243249949 is about 15596.4723254972. The cubic root of 243249949 is about 624.2390303363.

The spelling of 243249949 in words is "two hundred forty-three million, two hundred forty-nine thousand, nine hundred forty-nine".