779561 has 2 divisors, whose sum is σ = 779562. Its totient is φ = 779560.

The previous prime is 779543. The next prime is 779563. The reversal of 779561 is 165977.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 714025 + 65536 = 845^2 + 256^2 .

It is a cyclic number.

It is not a de Polignac number, because 779561 - 2¹⁰ = 778537 is a prime.

It is a Sophie Germain prime.

Together with 779563, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (779563) 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, 389780 + 389781.

It is an arithmetic number, because the mean of its divisors is an integer number (389781).

2⁷⁷⁹⁵⁶¹ is an apocalyptic number.

It is an amenable number.

779561 is a deficient number, since it is larger than the sum of its proper divisors (1).

779561 is an equidigital number, since it uses as much as digits as its factorization.

779561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13230, while the sum is 35.

The square root of 779561 is about 882.9275168438. The cubic root of 779561 is about 92.0343680670.

The spelling of 779561 in words is "seven hundred seventy-nine thousand, five hundred sixty-one".