81041389 has 8 divisors (see below), whose sum is σ = 95209632. Its totient is φ = 68006640.

The previous prime is 81041377. The next prime is 81041393. The reversal of 81041389 is 98314018.

It is a happy number.

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

It is not a de Polignac number, because 81041389 - 2¹⁷ = 80910317 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 (81041339) 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, 283219 + ... + 283504.

It is an arithmetic number, because the mean of its divisors is an integer number (11901204).

Almost surely, 2^81041389 is an apocalyptic number.

It is an amenable number.

81041389 is a deficient number, since it is larger than the sum of its proper divisors (14168243).

81041389 is a wasteful number, since it uses less digits than its factorization.

81041389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 566747.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 81041389 is about 9002.2990952312. The cubic root of 81041389 is about 432.7485539355.

The spelling of 81041389 in words is "eighty-one million, forty-one thousand, three hundred eighty-nine".