11231111987 has 2 divisors, whose sum is σ = 11231111988. Its totient is φ = 11231111986.

The previous prime is 11231111951. The next prime is 11231112007. The reversal of 11231111987 is 78911113211.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11231111987 - 2²⁸ = 10962676531 is a prime.

It is a super-2 number, since 2×11231111987² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (11231114987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5615555993 + 5615555994.

It is an arithmetic number, because the mean of its divisors is an integer number (5615555994).

Almost surely, 2^11231111987 is an apocalyptic number.

11231111987 is a deficient number, since it is larger than the sum of its proper divisors (1).

11231111987 is an equidigital number, since it uses as much as digits as its factorization.

11231111987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 35.

The spelling of 11231111987 in words is "eleven billion, two hundred thirty-one million, one hundred eleven thousand, nine hundred eighty-seven".