11231443987 has 4 divisors (see below), whose sum is σ = 11231678536. Its totient is φ = 11231209440.

The previous prime is 11231443957. The next prime is 11231443997. The reversal of 11231443987 is 78934413211.

11231443987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78934413211 = 1993 ⋅39605827.

It is a cyclic number.

It is not a de Polignac number, because 11231443987 - 2⁷ = 11231443859 is a prime.

It is a super-2 number, since 2×11231443987² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11231443957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16689 + ... + 150802.

It is an arithmetic number, because the mean of its divisors is an integer number (2807919634).

Almost surely, 2^11231443987 is an apocalyptic number.

11231443987 is a deficient number, since it is larger than the sum of its proper divisors (234549).

11231443987 is an equidigital number, since it uses as much as digits as its factorization.

11231443987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234548.

The product of its digits is 145152, while the sum is 43.

The spelling of 11231443987 in words is "eleven billion, two hundred thirty-one million, four hundred forty-three thousand, nine hundred eighty-seven".