81835611 has 16 divisors (see below), whose sum is σ = 128190720. Its totient is φ = 45781920.

The previous prime is 81835597. The next prime is 81835613. The reversal of 81835611 is 11653818.

It is not a de Polignac number, because 81835611 - 2¹⁰ = 81834587 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (81835613) 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, 94951 + ... + 95808.

It is an arithmetic number, because the mean of its divisors is an integer number (8011920).

Almost surely, 2^81835611 is an apocalyptic number.

81835611 is a deficient number, since it is larger than the sum of its proper divisors (46355109).

81835611 is a wasteful number, since it uses less digits than its factorization.

81835611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190786.

The product of its digits is 5760, while the sum is 33.

The square root of 81835611 is about 9046.3037203048. The cubic root of 81835611 is about 434.1576352631.

The spelling of 81835611 in words is "eighty-one million, eight hundred thirty-five thousand, six hundred eleven".