1817122112 has 56 divisors (see below), whose sum is σ = 4111681896. Its totient is φ = 789331968.

The previous prime is 1817122103. The next prime is 1817122117. The reversal of 1817122112 is 2112217181.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 662753536 + 1154368576 = 25744^2 + 33976^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1817122117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50093 + ... + 78380.

It is an arithmetic number, because the mean of its divisors is an integer number (73422891).

Almost surely, 2^1817122112 is an apocalyptic number.

It is an amenable number.

1817122112 is an abundant number, since it is smaller than the sum of its proper divisors (2294559784).

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

1817122112 is a wasteful number, since it uses less digits than its factorization.

1817122112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128515 (or 128505 counting only the distinct ones).

The product of its digits is 448, while the sum is 26.

The square root of 1817122112 is about 42627.7153035440. The cubic root of 1817122112 is about 1220.2852759378.

Adding to 1817122112 its reverse (2112217181), we get a palindrome (3929339293).

The spelling of 1817122112 in words is "one billion, eight hundred seventeen million, one hundred twenty-two thousand, one hundred twelve".