89181609 has 32 divisors (see below), whose sum is σ = 139345920. Its totient is φ = 50131200.

The previous prime is 89181593. The next prime is 89181619. The reversal of 89181609 is 90618198.

It is not a de Polignac number, because 89181609 - 2⁴ = 89181593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (89181619) 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 31 ways as a sum of consecutive naturals, for example, 38712 + ... + 40950.

It is an arithmetic number, because the mean of its divisors is an integer number (4354560).

Almost surely, 2^89181609 is an apocalyptic number.

It is an amenable number.

89181609 is a deficient number, since it is larger than the sum of its proper divisors (50164311).

89181609 is a wasteful number, since it uses less digits than its factorization.

89181609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2341.

The product of its (nonzero) digits is 31104, while the sum is 42.

The square root of 89181609 is about 9443.6014846032. The cubic root of 89181609 is about 446.7779878348. Note that the first 3 decimals are identical.

The spelling of 89181609 in words is "eighty-nine million, one hundred eighty-one thousand, six hundred nine".