870817020813 has 12 divisors (see below), whose sum is σ = 1257861381660. Its totient is φ = 580537954176.

The previous prime is 870817020811. The next prime is 870817020847. The reversal of 870817020813 is 318020718078.

It can be written as a sum of positive squares in 2 ways, for example, as 598477073769 + 272339947044 = 773613^2 + 521862^2 .

It is not a de Polignac number, because 870817020813 - 2¹ = 870817020811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870817020811) 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, 334645 + ... + 1361477.

It is an arithmetic number, because the mean of its divisors is an integer number (104821781805).

Almost surely, 2^870817020813 is an apocalyptic number.

It is an amenable number.

870817020813 is a deficient number, since it is larger than the sum of its proper divisors (387044360847).

870817020813 is a wasteful number, since it uses less digits than its factorization.

870817020813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121068 (or 1121065 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 45.

The spelling of 870817020813 in words is "eight hundred seventy billion, eight hundred seventeen million, twenty thousand, eight hundred thirteen".