867931781121 has 48 divisors (see below), whose sum is σ = 1400838366720. Its totient is φ = 530484435360.

The previous prime is 867931781077. The next prime is 867931781239. The reversal of 867931781121 is 121187139768.

It is not a de Polignac number, because 867931781121 - 2¹⁴ = 867931764737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (867931781021) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1134070 + ... + 1738383.

It is an arithmetic number, because the mean of its divisors is an integer number (29184132640).

Almost surely, 2^867931781121 is an apocalyptic number.

It is an amenable number.

867931781121 is a deficient number, since it is larger than the sum of its proper divisors (532906585599).

867931781121 is a wasteful number, since it uses less digits than its factorization.

867931781121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2872531 (or 2872506 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 54.

The spelling of 867931781121 in words is "eight hundred sixty-seven billion, nine hundred thirty-one million, seven hundred eighty-one thousand, one hundred twenty-one".