861084929 has 2 divisors, whose sum is σ = 861084930. Its totient is φ = 861084928.

The previous prime is 861084853. The next prime is 861084937. The reversal of 861084929 is 929480168.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 814531600 + 46553329 = 28540^2 + 6823^2 .

It is a cyclic number.

It is not a de Polignac number, because 861084929 - 2¹² = 861080833 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (861084989) 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, 430542464 + 430542465.

It is an arithmetic number, because the mean of its divisors is an integer number (430542465).

Almost surely, 2^861084929 is an apocalyptic number.

It is an amenable number.

861084929 is a deficient number, since it is larger than the sum of its proper divisors (1).

861084929 is an equidigital number, since it uses as much as digits as its factorization.

861084929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 47.

The square root of 861084929 is about 29344.2486528451. The cubic root of 861084929 is about 951.3682699077.

It can be divided in two parts, 8610 and 84929, that added together give a palindrome (93539).

The spelling of 861084929 in words is "eight hundred sixty-one million, eighty-four thousand, nine hundred twenty-nine".