81424011 has 16 divisors (see below), whose sum is σ = 112527360. Its totient is φ = 52316160.

The previous prime is 81424009. The next prime is 81424037. The reversal of 81424011 is 11042418.

It is a happy number.

It is not a de Polignac number, because 81424011 - 2¹ = 81424009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81424001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22795 + ... + 26123.

It is an arithmetic number, because the mean of its divisors is an integer number (7032960).

Almost surely, 2^81424011 is an apocalyptic number.

81424011 is a deficient number, since it is larger than the sum of its proper divisors (31103349).

81424011 is a wasteful number, since it uses less digits than its factorization.

81424011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3626.

The product of its (nonzero) digits is 256, while the sum is 21.

The square root of 81424011 is about 9023.5254197015. The cubic root of 81424011 is about 433.4285324701.

Adding to 81424011 its reverse (11042418), we get a palindrome (92466429).

The spelling of 81424011 in words is "eighty-one million, four hundred twenty-four thousand, eleven".