89438839991 has 4 divisors (see below), whose sum is σ = 93327485232. Its totient is φ = 85550194752.

The previous prime is 89438839957. The next prime is 89438840041. The reversal of 89438839991 is 19993883498.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 89438839991 - 2¹⁰ = 89438838967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (89438839921) 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, 1944322586 + ... + 1944322631.

It is an arithmetic number, because the mean of its divisors is an integer number (23331871308).

Almost surely, 2^89438839991 is an apocalyptic number.

89438839991 is a deficient number, since it is larger than the sum of its proper divisors (3888645241).

89438839991 is a wasteful number, since it uses less digits than its factorization.

89438839991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3888645240.

The product of its digits is 120932352, while the sum is 71.

The spelling of 89438839991 in words is "eighty-nine billion, four hundred thirty-eight million, eight hundred thirty-nine thousand, nine hundred ninety-one".