8604688891 has 2 divisors, whose sum is σ = 8604688892. Its totient is φ = 8604688890.

The previous prime is 8604688837. The next prime is 8604688949. The reversal of 8604688891 is 1988864068.

It is an a-pointer prime, because the next prime (8604688949) can be obtained adding 8604688891 to its sum of digits (58).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8604688891 - 2¹¹ = 8604686843 is a prime.

It is not a weakly prime, because it can be changed into another prime (8604688811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4302344445 + 4302344446.

It is an arithmetic number, because the mean of its divisors is an integer number (4302344446).

Almost surely, 2^8604688891 is an apocalyptic number.

8604688891 is the 58668-th centered pentagonal number.

8604688891 is a deficient number, since it is larger than the sum of its proper divisors (1).

8604688891 is an equidigital number, since it uses as much as digits as its factorization.

8604688891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5308416, while the sum is 58.

The square root of 8604688891 is about 92761.4623159855. The cubic root of 8604688891 is about 2049.1718956306.

The spelling of 8604688891 in words is "eight billion, six hundred four million, six hundred eighty-eight thousand, eight hundred ninety-one".