870911999 has 4 divisors (see below), whose sum is σ = 871080936. Its totient is φ = 870743064.

The previous prime is 870911983. The next prime is 870912017. The reversal of 870911999 is 999119078.

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 870911999 - 2⁴ = 870911983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 870911999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870911939) 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, 76484 + ... + 87129.

It is an arithmetic number, because the mean of its divisors is an integer number (217770234).

Almost surely, 2^870911999 is an apocalyptic number.

870911999 is a deficient number, since it is larger than the sum of its proper divisors (168937).

870911999 is a wasteful number, since it uses less digits than its factorization.

870911999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168936.

The product of its (nonzero) digits is 367416, while the sum is 53.

The square root of 870911999 is about 29511.2181890209. The cubic root of 870911999 is about 954.9737295296.

The spelling of 870911999 in words is "eight hundred seventy million, nine hundred eleven thousand, nine hundred ninety-nine".