81175342589 has 8 divisors (see below), whose sum is σ = 89549919360. Its totient is φ = 72966599200.

The previous prime is 81175342553. The next prime is 81175342649. The reversal of 81175342589 is 98524357118.

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

It is not a de Polignac number, because 81175342589 - 2²⁴ = 81158565373 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 81175342589.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81175342289) 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, 41457317 + ... + 41459274.

It is an arithmetic number, because the mean of its divisors is an integer number (11193739920).

Almost surely, 2^81175342589 is an apocalyptic number.

81175342589 is a gapful number since it is divisible by the number (89) formed by its first and last digit.

It is an amenable number.

81175342589 is a deficient number, since it is larger than the sum of its proper divisors (8374576771).

81175342589 is a wasteful number, since it uses less digits than its factorization.

81175342589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82916691.

The product of its digits is 2419200, while the sum is 53.

The spelling of 81175342589 in words is "eighty-one billion, one hundred seventy-five million, three hundred forty-two thousand, five hundred eighty-nine".