10111201987 has 4 divisors (see below), whose sum is σ = 10112881240. Its totient is φ = 10109522736.

The previous prime is 10111201963. The next prime is 10111202009. The reversal of 10111201987 is 78910211101.

It is a happy number.

10111201987 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: 78910211101 = 26801 ⋅2944301.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10111201987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10111201187) 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, 830562 + ... + 842647.

It is an arithmetic number, because the mean of its divisors is an integer number (2528220310).

Almost surely, 2^10111201987 is an apocalyptic number.

10111201987 is a deficient number, since it is larger than the sum of its proper divisors (1679253).

10111201987 is an equidigital number, since it uses as much as digits as its factorization.

10111201987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1679252.

The product of its (nonzero) digits is 1008, while the sum is 31.

The spelling of 10111201987 in words is "ten billion, one hundred eleven million, two hundred one thousand, nine hundred eighty-seven".