81590089 has 8 divisors (see below), whose sum is σ = 98731008. Its totient is φ = 65820480.

The previous prime is 81590057. The next prime is 81590099. The reversal of 81590089 is 98009518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81590089 - 2⁵ = 81590057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81590029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 342697 + ... + 342934.

It is an arithmetic number, because the mean of its divisors is an integer number (12341376).

Almost surely, 2^81590089 is an apocalyptic number.

It is an amenable number.

81590089 is a deficient number, since it is larger than the sum of its proper divisors (17140919).

81590089 is a wasteful number, since it uses less digits than its factorization.

81590089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685655.

The product of its (nonzero) digits is 25920, while the sum is 40.

The square root of 81590089 is about 9032.7232327798. The cubic root of 81590089 is about 433.7230158698.

The spelling of 81590089 in words is "eighty-one million, five hundred ninety thousand, eighty-nine".