81411 has 8 divisors (see below), whose sum is σ = 118464. Its totient is φ = 49320.

The previous prime is 81409. The next prime is 81421. The reversal of 81411 is 11418.

81411 = 50² + 51² + ... + 71².

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

It is not a de Polignac number, because 81411 - 2¹ = 81409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81401) 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, 1201 + ... + 1266.

It is an arithmetic number, because the mean of its divisors is an integer number (14808).

2⁸¹⁴¹¹ is an apocalyptic number.

81411 is a deficient number, since it is larger than the sum of its proper divisors (37053).

81411 is a wasteful number, since it uses less digits than its factorization.

81411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2481.

The product of its digits is 32, while the sum is 15.

The square root of 81411 is about 285.3261291925. The cubic root of 81411 is about 43.3405444935.

Adding to 81411 its reverse (11418), we get a palindrome (92829).

The spelling of 81411 in words is "eighty-one thousand, four hundred eleven".