81818811 has 12 divisors (see below), whose sum is σ = 118892592. Its totient is φ = 54218256.

The previous prime is 81818791. The next prime is 81818819. The reversal of 81818811 is 11881818.

It is not a de Polignac number, because 81818811 - 2⁶ = 81818747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81818819) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25716 + ... + 28721.

It is an arithmetic number, because the mean of its divisors is an integer number (9907716).

Almost surely, 2^81818811 is an apocalyptic number.

81818811 is a deficient number, since it is larger than the sum of its proper divisors (37073781).

81818811 is a wasteful number, since it uses less digits than its factorization.

81818811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54610 (or 54607 counting only the distinct ones).

The product of its digits is 4096, while the sum is 36.

The square root of 81818811 is about 9045.3751165996. The cubic root of 81818811 is about 434.1279238805.

The spelling of 81818811 in words is "eighty-one million, eight hundred eighteen thousand, eight hundred eleven".