81411210 has 64 divisors (see below), whose sum is σ = 220700160. Its totient is φ = 21349440.

The previous prime is 81411203. The next prime is 81411221. The reversal of 81411210 is 1211418.

It is a super-2 number, since 2×81411210² = 13255570227328200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13999 + ... + 18941.

It is an arithmetic number, because the mean of its divisors is an integer number (3448440).

Almost surely, 2^81411210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81411210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110350080).

81411210 is an abundant number, since it is smaller than the sum of its proper divisors (139288950).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81411210 is a wasteful number, since it uses less digits than its factorization.

81411210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5020 (or 5014 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 81411210 is about 9022.8160792515. The cubic root of 81411210 is about 433.4058175921.

Adding to 81411210 its reverse (1211418), we get a palindrome (82622628).

The spelling of 81411210 in words is "eighty-one million, four hundred eleven thousand, two hundred ten".