82105609 has 4 divisors (see below), whose sum is σ = 82518400. Its totient is φ = 81692820.

The previous prime is 82105603. The next prime is 82105613. The reversal of 82105609 is 90650128.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82105609 - 2³ = 82105601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82105601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206097 + ... + 206494.

It is an arithmetic number, because the mean of its divisors is an integer number (20629600).

Almost surely, 2^82105609 is an apocalyptic number.

It is an amenable number.

82105609 is a deficient number, since it is larger than the sum of its proper divisors (412791).

82105609 is a wasteful number, since it uses less digits than its factorization.

82105609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412790.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 82105609 is about 9061.2145433159. The cubic root of 82105609 is about 434.6345792736.

The spelling of 82105609 in words is "eighty-two million, one hundred five thousand, six hundred nine".