108957721 has 2 divisors, whose sum is σ = 108957722. Its totient is φ = 108957720.

The previous prime is 108957713. The next prime is 108957749. The reversal of 108957721 is 127759801.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104775696 + 4182025 = 10236^2 + 2045^2 .

It is a cyclic number.

It is not a de Polignac number, because 108957721 - 2³ = 108957713 is a prime.

It is a super-3 number, since 3×108957721³ (a number of 25 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (108957701) 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 as a sum of consecutive naturals, namely, 54478860 + 54478861.

It is an arithmetic number, because the mean of its divisors is an integer number (54478861).

Almost surely, 2^108957721 is an apocalyptic number.

It is an amenable number.

108957721 is a deficient number, since it is larger than the sum of its proper divisors (1).

108957721 is an equidigital number, since it uses as much as digits as its factorization.

108957721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 40.

The square root of 108957721 is about 10438.2815156519. The cubic root of 108957721 is about 477.6238484337.

The spelling of 108957721 in words is "one hundred eight million, nine hundred fifty-seven thousand, seven hundred twenty-one".