812142111 has 32 divisors (see below), whose sum is σ = 1202261760. Its totient is φ = 483552000.

The previous prime is 812142109. The next prime is 812142127. The reversal of 812142111 is 111241218.

It is not a de Polignac number, because 812142111 - 2¹ = 812142109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812142101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 462411 + ... + 464163.

It is an arithmetic number, because the mean of its divisors is an integer number (37570680).

Almost surely, 2^812142111 is an apocalyptic number.

812142111 is a deficient number, since it is larger than the sum of its proper divisors (390119649).

812142111 is a wasteful number, since it uses less digits than its factorization.

812142111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2007.

The product of its digits is 128, while the sum is 21.

The square root of 812142111 is about 28498.1071476686. The cubic root of 812142111 is about 932.9907614230.

Adding to 812142111 its reverse (111241218), we get a palindrome (923383329).

The spelling of 812142111 in words is "eight hundred twelve million, one hundred forty-two thousand, one hundred eleven".