108664921 has 4 divisors (see below), whose sum is σ = 108689332. Its totient is φ = 108640512.

The previous prime is 108664891. The next prime is 108664931. The reversal of 108664921 is 129466801.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55666521 + 52998400 = 7461^2 + 7280^2 .

It is a cyclic number.

It is not a de Polignac number, because 108664921 - 2⁷ = 108664793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (108664931) 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 3 ways as a sum of consecutive naturals, for example, 3420 + ... + 15133.

It is an arithmetic number, because the mean of its divisors is an integer number (27172333).

Almost surely, 2^108664921 is an apocalyptic number.

It is an amenable number.

108664921 is a deficient number, since it is larger than the sum of its proper divisors (24411).

108664921 is an equidigital number, since it uses as much as digits as its factorization.

108664921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24410.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 108664921 is about 10424.2467833412. The cubic root of 108664921 is about 477.1956281435.

The spelling of 108664921 in words is "one hundred eight million, six hundred sixty-four thousand, nine hundred twenty-one".