109564639 has 6 divisors (see below), whose sum is σ = 113473880. Its totient is φ = 105785736.

The previous prime is 109564627. The next prime is 109564649. The reversal of 109564639 is 936465901.

It is not a de Polignac number, because 109564639 - 2¹¹ = 109562591 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 109564595 and 109564604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109564619) 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 5 ways as a sum of consecutive naturals, for example, 64299 + ... + 65980.

Almost surely, 2^109564639 is an apocalyptic number.

109564639 is a deficient number, since it is larger than the sum of its proper divisors (3909241).

109564639 is an equidigital number, since it uses as much as digits as its factorization.

109564639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130337 (or 130308 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 109564639 is about 10467.3128834482. The cubic root of 109564639 is about 478.5090295205.

The spelling of 109564639 in words is "one hundred nine million, five hundred sixty-four thousand, six hundred thirty-nine".