81143110 has 16 divisors (see below), whose sum is σ = 153745200. Its totient is φ = 30748896.

The previous prime is 81143093. The next prime is 81143137. The reversal of 81143110 is 1134118.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213345 + ... + 213724.

It is an arithmetic number, because the mean of its divisors is an integer number (9609075).

Almost surely, 2^81143110 is an apocalyptic number.

81143110 is a deficient number, since it is larger than the sum of its proper divisors (72602090).

81143110 is a wasteful number, since it uses less digits than its factorization.

81143110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427095.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 81143110 is about 9007.9470469136. The cubic root of 81143110 is about 432.9295364006.

Adding to 81143110 its reverse (1134118), we get a palindrome (82277228).

The spelling of 81143110 in words is "eighty-one million, one hundred forty-three thousand, one hundred ten".