870518891 has 12 divisors (see below), whose sum is σ = 965334216. Its totient is φ = 784365120.

The previous prime is 870518867. The next prime is 870518893. The reversal of 870518891 is 198815078.

870518891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-870518891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (870518893) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18161 + ... + 45506.

It is an arithmetic number, because the mean of its divisors is an integer number (80444518).

Almost surely, 2^870518891 is an apocalyptic number.

870518891 is a deficient number, since it is larger than the sum of its proper divisors (94815325).

870518891 is a wasteful number, since it uses less digits than its factorization.

870518891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63802 (or 63791 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 47.

The square root of 870518891 is about 29504.5571225870. The cubic root of 870518891 is about 954.8300241148.

The spelling of 870518891 in words is "eight hundred seventy million, five hundred eighteen thousand, eight hundred ninety-one".