1211115312 has 60 divisors (see below), whose sum is σ = 3697576584. Its totient is φ = 367004160.

The previous prime is 1211115287. The next prime is 1211115319. The reversal of 1211115312 is 2135111121.

1211115312 is a `hidden beast` number, since 1 + 21 + 111 + 531 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1211115319) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 380713 + ... + 383880.

Almost surely, 2^1211115312 is an apocalyptic number.

1211115312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211115312 is an abundant number, since it is smaller than the sum of its proper divisors (2486461272).

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

1211115312 is a wasteful number, since it uses less digits than its factorization.

1211115312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764618 (or 764609 counting only the distinct ones).

The product of its digits is 60, while the sum is 18.

The square root of 1211115312 is about 34801.0820521431. The cubic root of 1211115312 is about 1065.9295408962.

Adding to 1211115312 its reverse (2135111121), we get a palindrome (3346226433).

The spelling of 1211115312 in words is "one billion, two hundred eleven million, one hundred fifteen thousand, three hundred twelve".