1909039081 has 2 divisors, whose sum is σ = 1909039082. Its totient is φ = 1909039080.

The previous prime is 1909039073. The next prime is 1909039141. The reversal of 1909039081 is 1809309091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1887033600 + 22005481 = 43440^2 + 4691^2 .

It is an emirp because it is prime and its reverse (1809309091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1909039081 - 2³ = 1909039073 is a prime.

It is a super-2 number, since 2×1909039081² = 7288860425570649122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1909039061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 954519540 + 954519541.

It is an arithmetic number, because the mean of its divisors is an integer number (954519541).

Almost surely, 2^1909039081 is an apocalyptic number.

It is an amenable number.

1909039081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1909039081 is an equidigital number, since it uses as much as digits as its factorization.

1909039081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 40.

The square root of 1909039081 is about 43692.5517794509. The cubic root of 1909039081 is about 1240.5233398383.

The spelling of 1909039081 in words is "one billion, nine hundred nine million, thirty-nine thousand, eighty-one".