1817111212 has 24 divisors (see below), whose sum is σ = 3653063456. Its totient is φ = 774724608.

The previous prime is 1817111207. The next prime is 1817111279. The reversal of 1817111212 is 2121117181.

It is a super-2 number, since 2×1817111212² = 6603786313552217888, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 162723 + ... + 173530.

Almost surely, 2^1817111212 is an apocalyptic number.

It is an amenable number.

1817111212 is an abundant number, since it is smaller than the sum of its proper divisors (1835952244).

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

1817111212 is a wasteful number, since it uses less digits than its factorization.

1817111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336457 (or 336455 counting only the distinct ones).

The product of its digits is 224, while the sum is 25.

The square root of 1817111212 is about 42627.5874522591. The cubic root of 1817111212 is about 1220.2828359740.

Adding to 1817111212 its reverse (2121117181), we get a palindrome (3938228393).

The spelling of 1817111212 in words is "one billion, eight hundred seventeen million, one hundred eleven thousand, two hundred twelve".