8991819 has 6 divisors (see below), whose sum is σ = 12988196. Its totient is φ = 5994540.

The previous prime is 8991799. The next prime is 8991823. The reversal of 8991819 is 9181998.

It is not a de Polignac number, because 8991819 - 2¹² = 8987723 is a prime.

It is a super-2 number, since 2×8991819² = 161705617857522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8991839) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 499537 + ... + 499554.

Almost surely, 2^8991819 is an apocalyptic number.

8991819 is a deficient number, since it is larger than the sum of its proper divisors (3996377).

8991819 is a wasteful number, since it uses less digits than its factorization.

8991819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 999097 (or 999094 counting only the distinct ones).

The product of its digits is 46656, while the sum is 45.

The square root of 8991819 is about 2998.6361900037. The cubic root of 8991819 is about 207.9453366587.

The spelling of 8991819 in words is "eight million, nine hundred ninety-one thousand, eight hundred nineteen".