81201 has 4 divisors (see below), whose sum is σ = 108272. Its totient is φ = 54132.

The previous prime is 81199. The next prime is 81203. The reversal of 81201 is 10218.

It is a happy number.

81201 is nontrivially palindromic in base 16.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (81199) and next prime (81203).

It is not a de Polignac number, because 81201 - 2¹ = 81199 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81203) 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, 13531 + ... + 13536.

It is an arithmetic number, because the mean of its divisors is an integer number (27068).

2⁸¹²⁰¹ is an apocalyptic number.

It is an amenable number.

81201 is a deficient number, since it is larger than the sum of its proper divisors (27071).

81201 is a wasteful number, since it uses less digits than its factorization.

81201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27070.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 81201 is about 284.9578916261. The cubic root of 81201 is about 43.3032467026.

Adding to 81201 its reverse (10218), we get a palindrome (91419).

It can be divided in two parts, 81 and 201, that added together give a palindrome (282).

The spelling of 81201 in words is "eighty-one thousand, two hundred one".