81411822 has 24 divisors (see below), whose sum is σ = 176847840. Its totient is φ = 27067200.

The previous prime is 81411821. The next prime is 81411823. The reversal of 81411822 is 22811418.

It is an interprime number because it is at equal distance from previous prime (81411821) and next prime (81411823).

It is a super-2 number, since 2×81411822² = 13255769522719368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81411821) 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 11 ways as a sum of consecutive naturals, for example, 1579 + ... + 12857.

It is an arithmetic number, because the mean of its divisors is an integer number (7368660).

Almost surely, 2^81411822 is an apocalyptic number.

81411822 is an abundant number, since it is smaller than the sum of its proper divisors (95436018).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81411822 is a wasteful number, since it uses less digits than its factorization.

81411822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11688 (or 11685 counting only the distinct ones).

The product of its digits is 1024, while the sum is 27.

The square root of 81411822 is about 9022.8499932117. The cubic root of 81411822 is about 433.4069036165.

The spelling of 81411822 in words is "eighty-one million, four hundred eleven thousand, eight hundred twenty-two".