108635921 has 2 divisors, whose sum is σ = 108635922. Its totient is φ = 108635920.

The previous prime is 108635897. The next prime is 108635929. The reversal of 108635921 is 129536801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59845696 + 48790225 = 7736^2 + 6985^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-108635921 is a prime.

It is not a weakly prime, because it can be changed into another prime (108635929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54317960 + 54317961.

It is an arithmetic number, because the mean of its divisors is an integer number (54317961).

Almost surely, 2^108635921 is an apocalyptic number.

It is an amenable number.

108635921 is a deficient number, since it is larger than the sum of its proper divisors (1).

108635921 is an equidigital number, since it uses as much as digits as its factorization.

108635921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 108635921 is about 10422.8557027333. The cubic root of 108635921 is about 477.1531737669.

The spelling of 108635921 in words is "one hundred eight million, six hundred thirty-five thousand, nine hundred twenty-one".