81113311 has 8 divisors (see below), whose sum is σ = 82857600. Its totient is φ = 79385880.

The previous prime is 81113303. The next prime is 81113317. The reversal of 81113311 is 11331118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81113311 - 2³ = 81113303 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 (81113317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5760 + ... + 13978.

It is an arithmetic number, because the mean of its divisors is an integer number (10357200).

Almost surely, 2^81113311 is an apocalyptic number.

81113311 is a deficient number, since it is larger than the sum of its proper divisors (1744289).

81113311 is a wasteful number, since it uses less digits than its factorization.

81113311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8429.

The product of its digits is 72, while the sum is 19.

The square root of 81113311 is about 9006.2928555538. The cubic root of 81113311 is about 432.8765335566.

Adding to 81113311 its reverse (11331118), we get a palindrome (92444429).

The spelling of 81113311 in words is "eighty-one million, one hundred thirteen thousand, three hundred eleven".