11512018891 has 2 divisors, whose sum is σ = 11512018892. Its totient is φ = 11512018890.

The previous prime is 11512018871. The next prime is 11512018913. The reversal of 11512018891 is 19881021511.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11512018891 - 2¹⁷ = 11511887819 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11512018891.

It is not a weakly prime, because it can be changed into another prime (11512018871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5756009445 + 5756009446.

It is an arithmetic number, because the mean of its divisors is an integer number (5756009446).

Almost surely, 2^11512018891 is an apocalyptic number.

11512018891 is a deficient number, since it is larger than the sum of its proper divisors (1).

11512018891 is an equidigital number, since it uses as much as digits as its factorization.

11512018891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 37.

The spelling of 11512018891 in words is "eleven billion, five hundred twelve million, eighteen thousand, eight hundred ninety-one".