109716121 has 2 divisors, whose sum is σ = 109716122. Its totient is φ = 109716120.

The previous prime is 109716119. The next prime is 109716133. The reversal of 109716121 is 121617901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89113600 + 20602521 = 9440^2 + 4539^2 .

It is an emirp because it is prime and its reverse (121617901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 109716121 - 2¹ = 109716119 is a prime.

Together with 109716119, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 109716121.

It is not a weakly prime, because it can be changed into another prime (109716151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54858060 + 54858061.

It is an arithmetic number, because the mean of its divisors is an integer number (54858061).

Almost surely, 2^109716121 is an apocalyptic number.

It is an amenable number.

109716121 is a deficient number, since it is larger than the sum of its proper divisors (1).

109716121 is an equidigital number, since it uses as much as digits as its factorization.

109716121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 28.

The square root of 109716121 is about 10474.5463386249. The cubic root of 109716121 is about 478.7294538149.

The spelling of 109716121 in words is "one hundred nine million, seven hundred sixteen thousand, one hundred twenty-one".