81051 has 4 divisors (see below), whose sum is σ = 108072. Its totient is φ = 54032.

The previous prime is 81049. The next prime is 81071. The reversal of 81051 is 15018.

It is a happy number.

81051 is nontrivially palindromic in base 12.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81051 - 2¹ = 81049 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 81051.

It is not an unprimeable number, because it can be changed into a prime (81001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13506 + ... + 13511.

It is an arithmetic number, because the mean of its divisors is an integer number (27018).

2⁸¹⁰⁵¹ is an apocalyptic number.

81051 is a deficient number, since it is larger than the sum of its proper divisors (27021).

81051 is a wasteful number, since it uses less digits than its factorization.

81051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27020.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 81051 is about 284.6945731833. The cubic root of 81051 is about 43.2765660347.

Adding to 81051 its reverse (15018), we get a palindrome (96069).

It can be divided in two parts, 810 and 51, that added together give a triangular number (861 = T₄₁).

The spelling of 81051 in words is "eighty-one thousand, fifty-one".