1909914121 has 2 divisors, whose sum is σ = 1909914122. Its totient is φ = 1909914120.

The previous prime is 1909914119. The next prime is 1909914131. The reversal of 1909914121 is 1214199091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1555119225 + 354794896 = 39435^2 + 18836^2 .

It is a cyclic number.

It is not a de Polignac number, because 1909914121 - 2¹ = 1909914119 is a prime.

Together with 1909914119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1909914131) 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, 954957060 + 954957061.

It is an arithmetic number, because the mean of its divisors is an integer number (954957061).

Almost surely, 2^1909914121 is an apocalyptic number.

It is an amenable number.

1909914121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1909914121 is an equidigital number, since it uses as much as digits as its factorization.

1909914121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 37.

The square root of 1909914121 is about 43702.5642382687. The cubic root of 1909914121 is about 1240.7128490950.

It can be divided in two parts, 1909914 and 121, that added together give a triangular number (1910035 = T₁₉₅₄).

The spelling of 1909914121 in words is "one billion, nine hundred nine million, nine hundred fourteen thousand, one hundred twenty-one".