8634816891 has 8 divisors (see below), whose sum is σ = 12792321360. Its totient is φ = 5756544576.

The previous prime is 8634816887. The next prime is 8634816943. The reversal of 8634816891 is 1986184368.

8634816891 is a `hidden beast` number, since 86 + 3 + 481 + 6 + 89 + 1 = 666.

8634816891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 8634816891 - 2² = 8634816887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8634816871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159903990 + ... + 159904043.

It is an arithmetic number, because the mean of its divisors is an integer number (1599040170).

Almost surely, 2^8634816891 is an apocalyptic number.

8634816891 is a deficient number, since it is larger than the sum of its proper divisors (4157504469).

8634816891 is a wasteful number, since it uses less digits than its factorization.

8634816891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319808042 (or 319808036 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 54.

The square root of 8634816891 is about 92923.7154390632. The cubic root of 8634816891 is about 2051.5607302434.

The spelling of 8634816891 in words is "eight billion, six hundred thirty-four million, eight hundred sixteen thousand, eight hundred ninety-one".