684842761 has 2 divisors, whose sum is σ = 684842762. Its totient is φ = 684842760.

The previous prime is 684842747. The next prime is 684842813. The reversal of 684842761 is 167248486.

684842761 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., 683508736 + 1334025 = 26144^2 + 1155^2 .

It is a cyclic number.

It is not a de Polignac number, because 684842761 - 2⁵ = 684842729 is a prime.

It is not a weakly prime, because it can be changed into another prime (684842261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 342421380 + 342421381.

It is an arithmetic number, because the mean of its divisors is an integer number (342421381).

Almost surely, 2^684842761 is an apocalyptic number.

It is an amenable number.

684842761 is a deficient number, since it is larger than the sum of its proper divisors (1).

684842761 is an equidigital number, since it uses as much as digits as its factorization.

684842761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 516096, while the sum is 46.

The square root of 684842761 is about 26169.5005875160. The cubic root of 684842761 is about 881.4485273028.

The spelling of 684842761 in words is "six hundred eighty-four million, eight hundred forty-two thousand, seven hundred sixty-one".