108387521 has 4 divisors (see below), whose sum is σ = 118240944. Its totient is φ = 98534100.

The previous prime is 108387511. The next prime is 108387527. The reversal of 108387521 is 125783801.

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 a de Polignac number, because none of the positive numbers 2^k-108387521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (108387527) 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, 4926695 + ... + 4926716.

It is an arithmetic number, because the mean of its divisors is an integer number (29560236).

Almost surely, 2^108387521 is an apocalyptic number.

108387521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

108387521 is a deficient number, since it is larger than the sum of its proper divisors (9853423).

108387521 is an equidigital number, since it uses as much as digits as its factorization.

108387521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9853422.

The product of its (nonzero) digits is 13440, while the sum is 35.

The square root of 108387521 is about 10410.9327632062. The cubic root of 108387521 is about 476.7892201766.

The spelling of 108387521 in words is "one hundred eight million, three hundred eighty-seven thousand, five hundred twenty-one".