108311921 has 2 divisors, whose sum is σ = 108311922. Its totient is φ = 108311920.

The previous prime is 108311911. The next prime is 108311939. The reversal of 108311921 is 129113801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86118400 + 22193521 = 9280^2 + 4711^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-108311921 is a prime.

It is not a weakly prime, because it can be changed into another prime (108311911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54155960 + 54155961.

It is an arithmetic number, because the mean of its divisors is an integer number (54155961).

Almost surely, 2^108311921 is an apocalyptic number.

It is an amenable number.

108311921 is a deficient number, since it is larger than the sum of its proper divisors (1).

108311921 is an equidigital number, since it uses as much as digits as its factorization.

108311921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 108311921 is about 10407.3013312770. The cubic root of 108311921 is about 476.6783413336.

The spelling of 108311921 in words is "one hundred eight million, three hundred eleven thousand, nine hundred twenty-one".