870817109 has 4 divisors (see below), whose sum is σ = 874430700. Its totient is φ = 867203520.

The previous prime is 870817097. The next prime is 870817111. The reversal of 870817109 is 901718078.

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

It can be written as a sum of positive squares in 2 ways, for example, as 612315025 + 258502084 = 24745^2 + 16078^2 .

It is a cyclic number.

It is not a de Polignac number, because 870817109 - 2⁸ = 870816853 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 (870817009) 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 3 ways as a sum of consecutive naturals, for example, 1806434 + ... + 1806915.

It is an arithmetic number, because the mean of its divisors is an integer number (218607675).

Almost surely, 2^870817109 is an apocalyptic number.

It is an amenable number.

870817109 is a deficient number, since it is larger than the sum of its proper divisors (3613591).

870817109 is a wasteful number, since it uses less digits than its factorization.

870817109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3613590.

The product of its (nonzero) digits is 28224, while the sum is 41.

The square root of 870817109 is about 29509.6104515122. The cubic root of 870817109 is about 954.9390452950.

The spelling of 870817109 in words is "eight hundred seventy million, eight hundred seventeen thousand, one hundred nine".