869880840191 has 4 divisors (see below), whose sum is σ = 948960916584. Its totient is φ = 790800763800.

The previous prime is 869880840187. The next prime is 869880840209. The reversal of 869880840191 is 191048088968.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 869880840191 - 2² = 869880840187 is a prime.

It is a super-2 number, since 2×869880840191² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (869880840121) 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, 39540038180 + ... + 39540038201.

It is an arithmetic number, because the mean of its divisors is an integer number (237240229146).

Almost surely, 2^869880840191 is an apocalyptic number.

869880840191 is a deficient number, since it is larger than the sum of its proper divisors (79080076393).

869880840191 is a wasteful number, since it uses less digits than its factorization.

869880840191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79080076392.

The product of its (nonzero) digits is 7962624, while the sum is 62.

The spelling of 869880840191 in words is "eight hundred sixty-nine billion, eight hundred eighty million, eight hundred forty thousand, one hundred ninety-one".