847687961 has 2 divisors, whose sum is σ = 847687962. Its totient is φ = 847687960.

The previous prime is 847687943. The next prime is 847687991. The reversal of 847687961 is 169786748.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 531025936 + 316662025 = 23044^2 + 17795^2 .

It is a cyclic number.

It is not a de Polignac number, because 847687961 - 2¹⁰ = 847686937 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 847687897 and 847687906.

It is not a weakly prime, because it can be changed into another prime (847687991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 423843980 + 423843981.

It is an arithmetic number, because the mean of its divisors is an integer number (423843981).

Almost surely, 2^847687961 is an apocalyptic number.

It is an amenable number.

847687961 is a deficient number, since it is larger than the sum of its proper divisors (1).

847687961 is an equidigital number, since it uses as much as digits as its factorization.

847687961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4064256, while the sum is 56.

The square root of 847687961 is about 29115.0813325328. The cubic root of 847687961 is about 946.4085862615.

It can be divided in two parts, 84768 and 7961, that added together give a palindrome (92729).

The spelling of 847687961 in words is "eight hundred forty-seven million, six hundred eighty-seven thousand, nine hundred sixty-one".