869715109 has 4 divisors (see below), whose sum is σ = 872296204. Its totient is φ = 867134016.

The previous prime is 869715103. The next prime is 869715131. The reversal of 869715109 is 901517968.

It is a happy number.

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 642369025 + 227346084 = 25345^2 + 15078^2 .

It is a cyclic number.

It is not a de Polignac number, because 869715109 - 2¹³ = 869706917 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 (869715103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1290042 + ... + 1290715.

It is an arithmetic number, because the mean of its divisors is an integer number (218074051).

Almost surely, 2^869715109 is an apocalyptic number.

It is an amenable number.

869715109 is a deficient number, since it is larger than the sum of its proper divisors (2581095).

869715109 is a wasteful number, since it uses less digits than its factorization.

869715109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2581094.

The product of its (nonzero) digits is 136080, while the sum is 46.

The square root of 869715109 is about 29490.9326573440. The cubic root of 869715109 is about 954.5360570995.

The spelling of 869715109 in words is "eight hundred sixty-nine million, seven hundred fifteen thousand, one hundred nine".