781985249 has 2 divisors, whose sum is σ = 781985250. Its totient is φ = 781985248.

The previous prime is 781985231. The next prime is 781985297. The reversal of 781985249 is 942589187.

781985249 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., 761373649 + 20611600 = 27593^2 + 4540^2 .

It is a cyclic number.

It is not a de Polignac number, because 781985249 - 2¹⁶ = 781919713 is a prime.

It is a super-2 number, since 2×781985249² = 1223001859307184002, 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 781985249.

It is not a weakly prime, because it can be changed into another prime (781985209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390992624 + 390992625.

It is an arithmetic number, because the mean of its divisors is an integer number (390992625).

Almost surely, 2^781985249 is an apocalyptic number.

It is an amenable number.

781985249 is a deficient number, since it is larger than the sum of its proper divisors (1).

781985249 is an equidigital number, since it uses as much as digits as its factorization.

781985249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 53.

The square root of 781985249 is about 27963.9991596338. Note that the first 3 decimals coincide. The cubic root of 781985249 is about 921.2967099870.

The spelling of 781985249 in words is "seven hundred eighty-one million, nine hundred eighty-five thousand, two hundred forty-nine".