869900991 has 8 divisors (see below), whose sum is σ = 1164489984. Its totient is φ = 577623000.

The previous prime is 869900953. The next prime is 869901037. The reversal of 869900991 is 199009968.

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

It is not a de Polignac number, because 869900991 - 2¹⁰ = 869899967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (869900491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 576871 + ... + 578376.

It is an arithmetic number, because the mean of its divisors is an integer number (145561248).

Almost surely, 2^869900991 is an apocalyptic number.

869900991 is a deficient number, since it is larger than the sum of its proper divisors (294588993).

869900991 is a wasteful number, since it uses less digits than its factorization.

869900991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1155501.

The product of its (nonzero) digits is 314928, while the sum is 51.

The square root of 869900991 is about 29494.0840000160. The cubic root of 869900991 is about 954.6040557773.

The spelling of 869900991 in words is "eight hundred sixty-nine million, nine hundred thousand, nine hundred ninety-one".