11031111987 has 16 divisors (see below), whose sum is σ = 16823804160. Its totient is φ = 6298058592.

The previous prime is 11031111947. The next prime is 11031112003. The reversal of 11031111987 is 78911113011.

It is not a de Polignac number, because 11031111987 - 2⁸ = 11031111731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11031111907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201412 + ... + 250257.

It is an arithmetic number, because the mean of its divisors is an integer number (1051487760).

Almost surely, 2^11031111987 is an apocalyptic number.

11031111987 is a deficient number, since it is larger than the sum of its proper divisors (5792692173).

11031111987 is a wasteful number, since it uses less digits than its factorization.

11031111987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452842.

The product of its (nonzero) digits is 1512, while the sum is 33.

Adding to 11031111987 its reverse (78911113011), we get a palindrome (89942224998).

The spelling of 11031111987 in words is "eleven billion, thirty-one million, one hundred eleven thousand, nine hundred eighty-seven".