81013011 has 16 divisors (see below), whose sum is σ = 109122048. Its totient is φ = 53460000.

The previous prime is 81013003. The next prime is 81013033. The reversal of 81013011 is 11031018.

It is not a de Polignac number, because 81013011 - 2³ = 81013003 is a prime.

It is a super-2 number, since 2×81013011² = 13126215902572242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81013111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203865 + ... + 204261.

It is an arithmetic number, because the mean of its divisors is an integer number (6820128).

Almost surely, 2^81013011 is an apocalyptic number.

81013011 is a deficient number, since it is larger than the sum of its proper divisors (28109037).

81013011 is a wasteful number, since it uses less digits than its factorization.

81013011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922.

The product of its (nonzero) digits is 24, while the sum is 15.

The square root of 81013011 is about 9000.7228043086. The cubic root of 81013011 is about 432.6980366533.

Adding to 81013011 its reverse (11031018), we get a palindrome (92044029).

The spelling of 81013011 in words is "eighty-one million, thirteen thousand, eleven".