8991238601 has 4 divisors (see below), whose sum is σ = 8996025600. Its totient is φ = 8986451604.

The previous prime is 8991238589. The next prime is 8991238609. The reversal of 8991238601 is 1068321998.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1068321998 = 2 ⋅534160999.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8991238601 is a prime.

It is a super-2 number, since 2×8991238601² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8991238609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2390681 + ... + 2394438.

It is an arithmetic number, because the mean of its divisors is an integer number (2249006400).

Almost surely, 2^8991238601 is an apocalyptic number.

It is an amenable number.

8991238601 is a deficient number, since it is larger than the sum of its proper divisors (4786999).

8991238601 is a wasteful number, since it uses less digits than its factorization.

8991238601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4786998.

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 8991238601 is about 94822.1419342550. The cubic root of 8991238601 is about 2079.4086244855.

The spelling of 8991238601 in words is "eight billion, nine hundred ninety-one million, two hundred thirty-eight thousand, six hundred one".