778003243 has 2 divisors, whose sum is σ = 778003244. Its totient is φ = 778003242.

The previous prime is 778003223. The next prime is 778003277. The reversal of 778003243 is 342300877.

It is an a-pointer prime, because the next prime (778003277) can be obtained adding 778003243 to its sum of digits (34).

It is a weak prime.

It is an emirp because it is prime and its reverse (342300877) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 778003243 - 2²⁵ = 744448811 is a prime.

It is a super-2 number, since 2×778003243² = 1210578092237034098, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 778003199 and 778003208.

It is not a weakly prime, because it can be changed into another prime (778003223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389001621 + 389001622.

It is an arithmetic number, because the mean of its divisors is an integer number (389001622).

Almost surely, 2^778003243 is an apocalyptic number.

778003243 is a deficient number, since it is larger than the sum of its proper divisors (1).

778003243 is an equidigital number, since it uses as much as digits as its factorization.

778003243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 778003243 is about 27892.7094954936. The cubic root of 778003243 is about 919.7302466064.

The spelling of 778003243 in words is "seven hundred seventy-eight million, three thousand, two hundred forty-three".