89000991 has 16 divisors (see below), whose sum is σ = 133824000. Its totient is φ = 58447224.

The previous prime is 89000981. The next prime is 89001019. The reversal of 89000991 is 19900098.

It is not a de Polignac number, because 89000991 - 2¹⁴ = 88984607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89000911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22791 + ... + 26408.

It is an arithmetic number, because the mean of its divisors is an integer number (8364000).

Almost surely, 2^89000991 is an apocalyptic number.

89000991 is a deficient number, since it is larger than the sum of its proper divisors (44823009).

89000991 is a wasteful number, since it uses less digits than its factorization.

89000991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49275 (or 49269 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 89000991 is about 9434.0336548054. The cubic root of 89000991 is about 446.4761666918.

The spelling of 89000991 in words is "eighty-nine million, nine hundred ninety-one", and thus it is an aban number.