869931187421 has 8 divisors (see below), whose sum is σ = 890384695200. Its totient is φ = 849487795632.

The previous prime is 869931187409. The next prime is 869931187441. The reversal of 869931187421 is 124781139968.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-869931187421 is a prime.

It is a super-2 number, since 2×869931187421² (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 (869931187441) 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 7 ways as a sum of consecutive naturals, for example, 2354846 + ... + 2699103.

It is an arithmetic number, because the mean of its divisors is an integer number (111298086900).

Almost surely, 2^869931187421 is an apocalyptic number.

It is an amenable number.

869931187421 is a deficient number, since it is larger than the sum of its proper divisors (20453507779).

869931187421 is a wasteful number, since it uses less digits than its factorization.

869931187421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5057995.

The product of its digits is 5225472, while the sum is 59.

The spelling of 869931187421 in words is "eight hundred sixty-nine billion, nine hundred thirty-one million, one hundred eighty-seven thousand, four hundred twenty-one".