869981038999 has 4 divisors (see below), whose sum is σ = 870072174664. Its totient is φ = 869889903336.

The previous prime is 869981038991. The next prime is 869981039047. The reversal of 869981038999 is 999830189968.

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

It is a 3-Lehmer number, since φ(869981038999) divides (869981038999-1)³.

It is a cyclic number.

It is not a de Polignac number, because 869981038999 - 2³ = 869981038991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (869981038991) by changing a digit.

It is a nontrivial repunit in base 9546.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45553512 + ... + 45572605.

It is an arithmetic number, because the mean of its divisors is an integer number (217518043666).

Almost surely, 2^869981038999 is an apocalyptic number.

869981038999 is a deficient number, since it is larger than the sum of its proper divisors (91135665).

869981038999 is an equidigital number, since it uses as much as digits as its factorization.

869981038999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91135664.

The product of its (nonzero) digits is 544195584, while the sum is 79.

The spelling of 869981038999 in words is "eight hundred sixty-nine billion, nine hundred eighty-one million, thirty-eight thousand, nine hundred ninety-nine".