8609139 has 64 divisors (see below), whose sum is σ = 16450560. Its totient is φ = 4320000.

The previous prime is 8609137. The next prime is 8609149. The reversal of 8609139 is 9319068.

8609139 = T₈₇ + T₈₈ + ... + T₃₇₃.

It is not a de Polignac number, because 8609139 - 2¹ = 8609137 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8609137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 85189 + ... + 85289.

It is an arithmetic number, because the mean of its divisors is an integer number (257040).

Almost surely, 2^8609139 is an apocalyptic number.

8609139 is a deficient number, since it is larger than the sum of its proper divisors (7841421).

8609139 is a wasteful number, since it uses less digits than its factorization.

8609139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 8609139 is about 2934.1334325487. The cubic root of 8609139 is about 204.9525093243.

Adding to 8609139 its sum of digits (36), we get a triangular number (8609175 = T₄₁₄₉).

It can be divided in two parts, 860 and 9139, that added together give a palindrome (9999).

The spelling of 8609139 in words is "eight million, six hundred nine thousand, one hundred thirty-nine".