81070011 has 32 divisors (see below), whose sum is σ = 132537600. Its totient is φ = 48565440.

The previous prime is 81069977. The next prime is 81070027. The reversal of 81070011 is 11007018.

It is not a de Polignac number, because 81070011 - 2¹⁴ = 81053627 is a prime.

It is a super-3 number, since 3×81070011³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (81070111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24900 + ... + 27966.

It is an arithmetic number, because the mean of its divisors is an integer number (4141800).

Almost surely, 2^81070011 is an apocalyptic number.

81070011 is a deficient number, since it is larger than the sum of its proper divisors (51467589).

81070011 is a wasteful number, since it uses less digits than its factorization.

81070011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3176 (or 3170 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 18.

The square root of 81070011 is about 9003.8886599069. Note that the first 3 decimals coincide. The cubic root of 81070011 is about 432.7994936318.

Adding to 81070011 its reverse (11007018), we get a palindrome (92077029).

The spelling of 81070011 in words is "eighty-one million, seventy thousand, eleven".