81052111 has 16 divisors (see below), whose sum is σ = 96039936. Its totient is φ = 66962016.

The previous prime is 81052099. The next prime is 81052117. The reversal of 81052111 is 11125018.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 81052111 - 2⁹ = 81051599 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 (81052117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20205 + ... + 23881.

It is an arithmetic number, because the mean of its divisors is an integer number (6002496).

Almost surely, 2^81052111 is an apocalyptic number.

81052111 is a deficient number, since it is larger than the sum of its proper divisors (14987825).

81052111 is a wasteful number, since it uses less digits than its factorization.

81052111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3798.

The product of its (nonzero) digits is 80, while the sum is 19.

The square root of 81052111 is about 9002.8945900749. The cubic root of 81052111 is about 432.7676377043.

Adding to 81052111 its reverse (11125018), we get a palindrome (92177129).

The spelling of 81052111 in words is "eighty-one million, fifty-two thousand, one hundred eleven".