1940109121 has 2 divisors, whose sum is σ = 1940109122. Its totient is φ = 1940109120.

The previous prime is 1940109109. The next prime is 1940109181. The reversal of 1940109121 is 1219010491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1177244721 + 762864400 = 34311^2 + 27620^2 .

It is a cyclic number.

It is not a de Polignac number, because 1940109121 - 2⁹ = 1940108609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1940109121.

It is not a weakly prime, because it can be changed into another prime (1940109181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 970054560 + 970054561.

It is an arithmetic number, because the mean of its divisors is an integer number (970054561).

Almost surely, 2^1940109121 is an apocalyptic number.

It is an amenable number.

1940109121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1940109121 is an equidigital number, since it uses as much as digits as its factorization.

1940109121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 28.

The square root of 1940109121 is about 44046.6698060137. The cubic root of 1940109121 is about 1247.2170880655.

The spelling of 1940109121 in words is "one billion, nine hundred forty million, one hundred nine thousand, one hundred twenty-one".