81811122 has 8 divisors (see below), whose sum is σ = 163622256. Its totient is φ = 27270372.

The previous prime is 81811109. The next prime is 81811141. The reversal of 81811122 is 22111818.

It is a sphenic number, since it is the product of 3 distinct primes.

81811122 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 81811092 and 81811101.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6817588 + ... + 6817599.

It is an arithmetic number, because the mean of its divisors is an integer number (20452782).

Almost surely, 2^81811122 is an apocalyptic number.

81811122 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

81811122 is a wasteful number, since it uses less digits than its factorization.

81811122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13635192.

The product of its digits is 256, while the sum is 24.

The square root of 81811122 is about 9044.9500827810. The cubic root of 81811122 is about 434.1143242607.

The spelling of 81811122 in words is "eighty-one million, eight hundred eleven thousand, one hundred twenty-two".