871837445121 has 4 divisors (see below), whose sum is σ = 1162449926832. Its totient is φ = 581224963412.

The previous prime is 871837445117. The next prime is 871837445123. The reversal of 871837445121 is 121544738178.

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 871837445121 - 2² = 871837445117 is a prime.

It is a super-2 number, since 2×871837445121² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (871837445123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 145306240851 + ... + 145306240856.

It is an arithmetic number, because the mean of its divisors is an integer number (290612481708).

Almost surely, 2^871837445121 is an apocalyptic number.

It is an amenable number.

871837445121 is a deficient number, since it is larger than the sum of its proper divisors (290612481711).

871837445121 is a wasteful number, since it uses less digits than its factorization.

871837445121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290612481710.

The product of its digits is 1505280, while the sum is 51.

The spelling of 871837445121 in words is "eight hundred seventy-one billion, eight hundred thirty-seven million, four hundred forty-five thousand, one hundred twenty-one".