109987121 has 2 divisors, whose sum is σ = 109987122. Its totient is φ = 109987120.

The previous prime is 109987091. The next prime is 109987123. The reversal of 109987121 is 121789901.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75881521 + 34105600 = 8711^2 + 5840^2 .

It is an emirp because it is prime and its reverse (121789901) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 109987121 - 2⁶ = 109987057 is a prime.

Together with 109987123, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (109987123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54993560 + 54993561.

It is an arithmetic number, because the mean of its divisors is an integer number (54993561).

Almost surely, 2^109987121 is an apocalyptic number.

It is an amenable number.

109987121 is a deficient number, since it is larger than the sum of its proper divisors (1).

109987121 is an equidigital number, since it uses as much as digits as its factorization.

109987121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 38.

The square root of 109987121 is about 10487.4744814946. The cubic root of 109987121 is about 479.1232853715.

The spelling of 109987121 in words is "one hundred nine million, nine hundred eighty-seven thousand, one hundred twenty-one".