8991598417 has 4 divisors (see below), whose sum is σ = 9028908196. Its totient is φ = 8954288640.

The previous prime is 8991598411. The next prime is 8991598457. The reversal of 8991598417 is 7148951998.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7148951998 = 2 ⋅3574475999.

It can be written as a sum of positive squares in 2 ways, for example, as 2972321361 + 6019277056 = 54519^2 + 77584^2 .

It is a cyclic number.

It is not a de Polignac number, because 8991598417 - 2³ = 8991598409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8991598411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18654528 + ... + 18655009.

It is an arithmetic number, because the mean of its divisors is an integer number (2257227049).

Almost surely, 2^8991598417 is an apocalyptic number.

It is an amenable number.

8991598417 is a deficient number, since it is larger than the sum of its proper divisors (37309779).

8991598417 is a wasteful number, since it uses less digits than its factorization.

8991598417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37309778.

The product of its digits is 6531840, while the sum is 61.

The square root of 8991598417 is about 94824.0392358393. The cubic root of 8991598417 is about 2079.4363623960.

The spelling of 8991598417 in words is "eight billion, nine hundred ninety-one million, five hundred ninety-eight thousand, four hundred seventeen".