81330135 has 16 divisors (see below), whose sum is σ = 131472096. Its totient is φ = 42928128.

The previous prime is 81330113. The next prime is 81330173. The reversal of 81330135 is 53103318.

It is not a de Polignac number, because 81330135 - 2⁹ = 81329623 is a prime.

It is a super-2 number, since 2×81330135² = 13229181718236450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26494 + ... + 29403.

It is an arithmetic number, because the mean of its divisors is an integer number (8217006).

Almost surely, 2^81330135 is an apocalyptic number.

81330135 is a deficient number, since it is larger than the sum of its proper divisors (50141961).

81330135 is a wasteful number, since it uses less digits than its factorization.

81330135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56002.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 81330135 is about 9018.3221832002. The cubic root of 81330135 is about 433.2618978234.

The spelling of 81330135 in words is "eighty-one million, three hundred thirty thousand, one hundred thirty-five".