1216087011 has 24 divisors (see below), whose sum is σ = 1781676000. Its totient is φ = 799193472.

The previous prime is 1216087009. The next prime is 1216087031. The reversal of 1216087011 is 1107806121.

It is not a de Polignac number, because 1216087011 - 2¹ = 1216087009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1216087031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 285445 + ... + 289673.

It is an arithmetic number, because the mean of its divisors is an integer number (74236500).

Almost surely, 2^1216087011 is an apocalyptic number.

1216087011 is a deficient number, since it is larger than the sum of its proper divisors (565588989).

1216087011 is a wasteful number, since it uses less digits than its factorization.

1216087011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4683 (or 4680 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 27.

The square root of 1216087011 is about 34872.4391317843. The cubic root of 1216087011 is about 1067.3861172474.

The spelling of 1216087011 in words is "one billion, two hundred sixteen million, eighty-seven thousand, eleven".