1811215212 has 24 divisors (see below), whose sum is σ = 4324453056. Its totient is φ = 589697808.

The previous prime is 1811215193. The next prime is 1811215229. The reversal of 1811215212 is 2125121181.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1754538 + ... + 1755569.

It is an arithmetic number, because the mean of its divisors is an integer number (180185544).

Almost surely, 2^1811215212 is an apocalyptic number.

1811215212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1811215212 is an abundant number, since it is smaller than the sum of its proper divisors (2513237844).

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

1811215212 is a wasteful number, since it uses less digits than its factorization.

1811215212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3510157 (or 3510155 counting only the distinct ones).

The product of its digits is 320, while the sum is 24.

The square root of 1811215212 is about 42558.3741700737. The cubic root of 1811215212 is about 1218.9615843671.

Adding to 1811215212 its reverse (2125121181), we get a palindrome (3936336393).

The spelling of 1811215212 in words is "one billion, eight hundred eleven million, two hundred fifteen thousand, two hundred twelve".