109118521 has 2 divisors, whose sum is σ = 109118522. Its totient is φ = 109118520.

The previous prime is 109118519. The next prime is 109118531. The reversal of 109118521 is 125811901.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75012921 + 34105600 = 8661^2 + 5840^2 .

It is a cyclic number.

It is not a de Polignac number, because 109118521 - 2¹ = 109118519 is a prime.

It is a super-3 number, since 3×109118521³ (a number of 25 digits) contains 333 as substring.

Together with 109118519, 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 109118521.

It is not a weakly prime, because it can be changed into another prime (109118531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54559260 + 54559261.

It is an arithmetic number, because the mean of its divisors is an integer number (54559261).

Almost surely, 2^109118521 is an apocalyptic number.

It is an amenable number.

109118521 is a deficient number, since it is larger than the sum of its proper divisors (1).

109118521 is an equidigital number, since it uses as much as digits as its factorization.

109118521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 28.

The square root of 109118521 is about 10445.9810932243. The cubic root of 109118521 is about 477.8586923211.

The spelling of 109118521 in words is "one hundred nine million, one hundred eighteen thousand, five hundred twenty-one".