81334311 has 4 divisors (see below), whose sum is σ = 108445752. Its totient is φ = 54222872.

The previous prime is 81334303. The next prime is 81334333. The reversal of 81334311 is 11343318.

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 81334311 - 2³ = 81334303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81334301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13555716 + ... + 13555721.

It is an arithmetic number, because the mean of its divisors is an integer number (27111438).

Almost surely, 2^81334311 is an apocalyptic number.

81334311 is a deficient number, since it is larger than the sum of its proper divisors (27111441).

81334311 is a wasteful number, since it uses less digits than its factorization.

81334311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27111440.

The product of its digits is 864, while the sum is 24.

The square root of 81334311 is about 9018.5537088826. The cubic root of 81334311 is about 433.2693131589.

Adding to 81334311 its reverse (11343318), we get a palindrome (92677629).

The spelling of 81334311 in words is "eighty-one million, three hundred thirty-four thousand, three hundred eleven".