81804271 has 8 divisors (see below), whose sum is σ = 82830384. Its totient is φ = 80782080.

The previous prime is 81804269. The next prime is 81804287. The reversal of 81804271 is 17240818.

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 81804271 - 2¹ = 81804269 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 (81804211) 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, 74436 + ... + 75526.

It is an arithmetic number, because the mean of its divisors is an integer number (10353798).

Almost surely, 2^81804271 is an apocalyptic number.

81804271 is a deficient number, since it is larger than the sum of its proper divisors (1026113).

81804271 is a wasteful number, since it uses less digits than its factorization.

81804271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1961.

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 81804271 is about 9044.5713552385. The cubic root of 81804271 is about 434.1022061029.

The spelling of 81804271 in words is "eighty-one million, eight hundred four thousand, two hundred seventy-one".