108707521 has 4 divisors (see below), whose sum is σ = 117069652. Its totient is φ = 100345392.

The previous prime is 108707519. The next prime is 108707549. The reversal of 108707521 is 125707801.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125707801 = 3271 ⋅38431.

It can be written as a sum of positive squares in 2 ways, for example, as 17313921 + 91393600 = 4161^2 + 9560^2 .

It is a cyclic number.

It is not a de Polignac number, because 108707521 - 2¹ = 108707519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108707321) 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, 4181046 + ... + 4181071.

It is an arithmetic number, because the mean of its divisors is an integer number (29267413).

Almost surely, 2^108707521 is an apocalyptic number.

It is an amenable number.

108707521 is a deficient number, since it is larger than the sum of its proper divisors (8362131).

108707521 is an equidigital number, since it uses as much as digits as its factorization.

108707521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8362130.

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 108707521 is about 10426.2898962191. The cubic root of 108707521 is about 477.2579784638.

The spelling of 108707521 in words is "one hundred eight million, seven hundred seven thousand, five hundred twenty-one".