81550122 has 32 divisors (see below), whose sum is σ = 175286592. Its totient is φ = 25200384.

The previous prime is 81550099. The next prime is 81550153. The reversal of 81550122 is 22105518.

It is a junction number, because it is equal to n+sod(n) for n = 81550092 and 81550101.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 868 + ... + 12800.

It is an arithmetic number, because the mean of its divisors is an integer number (5477706).

Almost surely, 2^81550122 is an apocalyptic number.

81550122 is an abundant number, since it is smaller than the sum of its proper divisors (93736470).

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

81550122 is a wasteful number, since it uses less digits than its factorization.

81550122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12022.

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 81550122 is about 9030.5106167924. The cubic root of 81550122 is about 433.6521843950.

The spelling of 81550122 in words is "eighty-one million, five hundred fifty thousand, one hundred twenty-two".