81234311 has 4 divisors (see below), whose sum is σ = 81720912. Its totient is φ = 80747712.

The previous prime is 81234289. The next prime is 81234323. The reversal of 81234311 is 11343218.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11343218 = 2 ⋅5671609.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81234311 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 (81204311) 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, 243050 + ... + 243383.

It is an arithmetic number, because the mean of its divisors is an integer number (20430228).

Almost surely, 2^81234311 is an apocalyptic number.

81234311 is a deficient number, since it is larger than the sum of its proper divisors (486601).

81234311 is a wasteful number, since it uses less digits than its factorization.

81234311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486600.

The product of its digits is 576, while the sum is 23.

The square root of 81234311 is about 9013.0078775068. The cubic root of 81234311 is about 433.0916730804.

Adding to 81234311 its reverse (11343218), we get a palindrome (92577529).

The spelling of 81234311 in words is "eighty-one million, two hundred thirty-four thousand, three hundred eleven".