109684521 has 12 divisors (see below), whose sum is σ = 159008772. Its totient is φ = 72857376.

The previous prime is 109684501. The next prime is 109684543. The reversal of 109684521 is 125486901.

It can be written as a sum of positive squares in 2 ways, for example, as 22467600 + 87216921 = 4740^2 + 9339^2 .

It is not a de Polignac number, because 109684521 - 2¹¹ = 109682473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (109684501) 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 11 ways as a sum of consecutive naturals, for example, 19506 + ... + 24491.

It is an arithmetic number, because the mean of its divisors is an integer number (13250731).

Almost surely, 2^109684521 is an apocalyptic number.

It is an amenable number.

109684521 is a deficient number, since it is larger than the sum of its proper divisors (49324251).

109684521 is a wasteful number, since it uses less digits than its factorization.

109684521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44280 (or 44277 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 109684521 is about 10473.0378114471. The cubic root of 109684521 is about 478.6834888185.

The spelling of 109684521 in words is "one hundred nine million, six hundred eighty-four thousand, five hundred twenty-one".