791396561 has 2 divisors, whose sum is σ = 791396562. Its totient is φ = 791396560.

The previous prime is 791396549. The next prime is 791396579. The reversal of 791396561 is 165693197.

It is a happy number.

791396561 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., 581726161 + 209670400 = 24119^2 + 14480^2 .

It is a cyclic number.

It is not a de Polignac number, because 791396561 - 2²² = 787202257 is a prime.

It is not a weakly prime, because it can be changed into another prime (791396591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 395698280 + 395698281.

It is an arithmetic number, because the mean of its divisors is an integer number (395698281).

Almost surely, 2^791396561 is an apocalyptic number.

It is an amenable number.

791396561 is a deficient number, since it is larger than the sum of its proper divisors (1).

791396561 is an equidigital number, since it uses as much as digits as its factorization.

791396561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 306180, while the sum is 47.

The square root of 791396561 is about 28131.7713804161. The cubic root of 791396561 is about 924.9779633416.

The spelling of 791396561 in words is "seven hundred ninety-one million, three hundred ninety-six thousand, five hundred sixty-one".