776047561 has 2 divisors, whose sum is σ = 776047562. Its totient is φ = 776047560.

The previous prime is 776047553. The next prime is 776047607. The reversal of 776047561 is 165740677.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 631567161 + 144480400 = 25131^2 + 12020^2 .

It is an emirp because it is prime and its reverse (165740677) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 776047561 - 2³ = 776047553 is a prime.

It is not a weakly prime, because it can be changed into another prime (776047541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 388023780 + 388023781.

It is an arithmetic number, because the mean of its divisors is an integer number (388023781).

Almost surely, 2^776047561 is an apocalyptic number.

It is an amenable number.

776047561 is a deficient number, since it is larger than the sum of its proper divisors (1).

776047561 is an equidigital number, since it uses as much as digits as its factorization.

776047561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 246960, while the sum is 43.

The square root of 776047561 is about 27857.6302114878. The cubic root of 776047561 is about 918.9589519899.

The spelling of 776047561 in words is "seven hundred seventy-six million, forty-seven thousand, five hundred sixty-one".