1108638121 has 2 divisors, whose sum is σ = 1108638122. Its totient is φ = 1108638120.

The previous prime is 1108638109. The next prime is 1108638133. The reversal of 1108638121 is 1218368011.

It is a balanced prime because it is at equal distance from previous prime (1108638109) and next prime (1108638133).

It can be written as a sum of positive squares in only one way, i.e., 851997721 + 256640400 = 29189^2 + 16020^2 .

It is a cyclic number.

It is not a de Polignac number, because 1108638121 - 2¹⁹ = 1108113833 is a prime.

It is not a weakly prime, because it can be changed into another prime (1108638101) 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, 554319060 + 554319061.

It is an arithmetic number, because the mean of its divisors is an integer number (554319061).

Almost surely, 2^1108638121 is an apocalyptic number.

It is an amenable number.

1108638121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1108638121 is an equidigital number, since it uses as much as digits as its factorization.

1108638121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 1108638121 is about 33296.2178182448. The cubic root of 1108638121 is about 1034.9751823341.

The spelling of 1108638121 in words is "one billion, one hundred eight million, six hundred thirty-eight thousand, one hundred twenty-one".