81026111 has 4 divisors (see below), whose sum is σ = 81176424. Its totient is φ = 80875800.

The previous prime is 81026059. The next prime is 81026129. The reversal of 81026111 is 11162018.

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 81026111 - 2¹⁸ = 80763967 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 (81029111) 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, 74345 + ... + 75426.

It is an arithmetic number, because the mean of its divisors is an integer number (20294106).

Almost surely, 2^81026111 is an apocalyptic number.

81026111 is a deficient number, since it is larger than the sum of its proper divisors (150313).

81026111 is a wasteful number, since it uses less digits than its factorization.

81026111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150312.

The product of its (nonzero) digits is 96, while the sum is 20.

The square root of 81026111 is about 9001.4504942259. The cubic root of 81026111 is about 432.7213581697.

Adding to 81026111 its reverse (11162018), we get a palindrome (92188129).

The spelling of 81026111 in words is "eighty-one million, twenty-six thousand, one hundred eleven".