8999559971 has 2 divisors, whose sum is σ = 8999559972. Its totient is φ = 8999559970.

The previous prime is 8999559949. The next prime is 8999560013. The reversal of 8999559971 is 1799559998.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8999559971 - 2²⁶ = 8932451107 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8999559895 and 8999559904.

It is not a weakly prime, because it can be changed into another prime (8999559941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4499779985 + 4499779986.

It is an arithmetic number, because the mean of its divisors is an integer number (4499779986).

Almost surely, 2^8999559971 is an apocalyptic number.

8999559971 is a deficient number, since it is larger than the sum of its proper divisors (1).

8999559971 is an equidigital number, since it uses as much as digits as its factorization.

8999559971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82668600, while the sum is 71.

The square root of 8999559971 is about 94866.0106202427. The cubic root of 8999559971 is about 2080.0499226029.

The spelling of 8999559971 in words is "eight billion, nine hundred ninety-nine million, five hundred fifty-nine thousand, nine hundred seventy-one".