8389527491 has 4 divisors (see below), whose sum is σ = 8408993184. Its totient is φ = 8370061800.

The previous prime is 8389527481. The next prime is 8389527547. The reversal of 8389527491 is 1947259838.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1947259838 = 2 ⋅973629919.

It is a cyclic number.

It is not a de Polignac number, because 8389527491 - 2¹⁴ = 8389511107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8389527431) 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, 9732200 + ... + 9733061.

It is an arithmetic number, because the mean of its divisors is an integer number (2102248296).

Almost surely, 2^8389527491 is an apocalyptic number.

8389527491 is a deficient number, since it is larger than the sum of its proper divisors (19465693).

8389527491 is a wasteful number, since it uses less digits than its factorization.

8389527491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19465692.

The product of its digits is 4354560, while the sum is 56.

The square root of 8389527491 is about 91594.3638604472. The cubic root of 8389527491 is about 2031.9475829519.

The spelling of 8389527491 in words is "eight billion, three hundred eighty-nine million, five hundred twenty-seven thousand, four hundred ninety-one".