81200411 has 4 divisors (see below), whose sum is σ = 81295800. Its totient is φ = 81105024.

The previous prime is 81200407. The next prime is 81200417. The reversal of 81200411 is 11400218.

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 81200411 - 2² = 81200407 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81200411.

It is not an unprimeable number, because it can be changed into a prime (81200417) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 46406 + ... + 48123.

It is an arithmetic number, because the mean of its divisors is an integer number (20323950).

Almost surely, 2^81200411 is an apocalyptic number.

81200411 is a deficient number, since it is larger than the sum of its proper divisors (95389).

81200411 is an equidigital number, since it uses as much as digits as its factorization.

81200411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95388.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 81200411 is about 9011.1270660223. The cubic root of 81200411 is about 433.0314200079.

Adding to 81200411 its reverse (11400218), we get a palindrome (92600629).

The spelling of 81200411 in words is "eighty-one million, two hundred thousand, four hundred eleven".