871121111001 has 4 divisors (see below), whose sum is σ = 1161494814672. Its totient is φ = 580747407332.

The previous prime is 871121110997. The next prime is 871121111023. The reversal of 871121111001 is 100111121178.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 871121111001 - 2² = 871121110997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (871121111041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145186851831 + ... + 145186851836.

It is an arithmetic number, because the mean of its divisors is an integer number (290373703668).

Almost surely, 2^871121111001 is an apocalyptic number.

It is an amenable number.

871121111001 is a deficient number, since it is larger than the sum of its proper divisors (290373703671).

871121111001 is a wasteful number, since it uses less digits than its factorization.

871121111001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290373703670.

The product of its (nonzero) digits is 112, while the sum is 24.

Adding to 871121111001 its reverse (100111121178), we get a palindrome (971232232179).

The spelling of 871121111001 in words is "eight hundred seventy-one billion, one hundred twenty-one million, one hundred eleven thousand, one".