81741189 has 16 divisors (see below), whose sum is σ = 110145024. Its totient is φ = 53919600.

The previous prime is 81741181. The next prime is 81741193. The reversal of 81741189 is 98114718.

It is not a de Polignac number, because 81741189 - 2³ = 81741181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81741181) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 166234 + ... + 166724.

It is an arithmetic number, because the mean of its divisors is an integer number (6884064).

Almost surely, 2^81741189 is an apocalyptic number.

It is an amenable number.

81741189 is a deficient number, since it is larger than the sum of its proper divisors (28403835).

81741189 is a wasteful number, since it uses less digits than its factorization.

81741189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968.

The product of its digits is 16128, while the sum is 39.

The square root of 81741189 is about 9041.0833974696. The cubic root of 81741189 is about 433.9905938485.

The spelling of 81741189 in words is "eighty-one million, seven hundred forty-one thousand, one hundred eighty-nine".