1211185512 has 48 divisors (see below), whose sum is σ = 3335904000. Its totient is φ = 396884256.

The previous prime is 1211185499. The next prime is 1211185523. The reversal of 1211185512 is 2155811121.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 138312 + ... + 146807.

It is an arithmetic number, because the mean of its divisors is an integer number (69498000).

Almost surely, 2^1211185512 is an apocalyptic number.

1211185512 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211185512 is an abundant number, since it is smaller than the sum of its proper divisors (2124718488).

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

1211185512 is a wasteful number, since it uses less digits than its factorization.

1211185512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285190 (or 285183 counting only the distinct ones).

The product of its digits is 800, while the sum is 27.

The square root of 1211185512 is about 34802.0906268575. The cubic root of 1211185512 is about 1065.9501353591.

Adding to 1211185512 its reverse (2155811121), we get a palindrome (3366996633).

The spelling of 1211185512 in words is "one billion, two hundred eleven million, one hundred eighty-five thousand, five hundred twelve".