81488811 has 16 divisors (see below), whose sum is σ = 113160960. Its totient is φ = 52096800.

The previous prime is 81488807. The next prime is 81488843. The reversal of 81488811 is 11888418.

It is not a de Polignac number, because 81488811 - 2² = 81488807 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81488811.

It is not an unprimeable number, because it can be changed into a prime (81488851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10036 + ... + 16238.

It is an arithmetic number, because the mean of its divisors is an integer number (7072560).

Almost surely, 2^81488811 is an apocalyptic number.

81488811 is a deficient number, since it is larger than the sum of its proper divisors (31672149).

81488811 is a wasteful number, since it uses less digits than its factorization.

81488811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6386.

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

The square root of 81488811 is about 9027.1153199679. The cubic root of 81488811 is about 433.5434810428.

The spelling of 81488811 in words is "eighty-one million, four hundred eighty-eight thousand, eight hundred eleven".