11311558887 has 12 divisors (see below), whose sum is σ = 15440988984. Its totient is φ = 7365662640.

The previous prime is 11311558877. The next prime is 11311558891. The reversal of 11311558887 is 78885511311.

It is not a de Polignac number, because 11311558887 - 2⁶ = 11311558823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11311558877) 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, 1014064 + ... + 1025157.

It is an arithmetic number, because the mean of its divisors is an integer number (1286749082).

Almost surely, 2^11311558887 is an apocalyptic number.

11311558887 is a deficient number, since it is larger than the sum of its proper divisors (4129430097).

11311558887 is an equidigital number, since it uses as much as digits as its factorization.

11311558887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2039310 (or 2039267 counting only the distinct ones).

The product of its digits is 268800, while the sum is 48.

The spelling of 11311558887 in words is "eleven billion, three hundred eleven million, five hundred fifty-eight thousand, eight hundred eighty-seven".