81884811 has 16 divisors (see below), whose sum is σ = 112632608. Its totient is φ = 52876800.

The previous prime is 81884809. The next prime is 81884819. The reversal of 81884811 is 11848818.

It is not a de Polignac number, because 81884811 - 2¹ = 81884809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81884811.

It is not an unprimeable number, because it can be changed into a prime (81884819) 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, 25221 + ... + 28281.

It is an arithmetic number, because the mean of its divisors is an integer number (7039538).

Almost surely, 2^81884811 is an apocalyptic number.

81884811 is a deficient number, since it is larger than the sum of its proper divisors (30747797).

81884811 is a wasteful number, since it uses less digits than its factorization.

81884811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3342.

The product of its digits is 16384, while the sum is 39.

The square root of 81884811 is about 9049.0226544086. The cubic root of 81884811 is about 434.2446237845.

The spelling of 81884811 in words is "eighty-one million, eight hundred eighty-four thousand, eight hundred eleven".