778361 has 2 divisors, whose sum is σ = 778362. Its totient is φ = 778360.

The previous prime is 778357. The next prime is 778363. The reversal of 778361 is 163877.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 469225 + 309136 = 685^2 + 556^2 .

It is a cyclic number.

It is not a de Polignac number, because 778361 - 2² = 778357 is a prime.

Together with 778363, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (778363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 389180 + 389181.

It is an arithmetic number, because the mean of its divisors is an integer number (389181).

2⁷⁷⁸³⁶¹ is an apocalyptic number.

It is an amenable number.

778361 is a deficient number, since it is larger than the sum of its proper divisors (1).

778361 is an equidigital number, since it uses as much as digits as its factorization.

778361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7056, while the sum is 32.

The square root of 778361 is about 882.2476976451. The cubic root of 778361 is about 91.9871201251.

The spelling of 778361 in words is "seven hundred seventy-eight thousand, three hundred sixty-one".