1909455139 has 2 divisors, whose sum is σ = 1909455140. Its totient is φ = 1909455138.

The previous prime is 1909455131. The next prime is 1909455151. The reversal of 1909455139 is 9315549091.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (9315549091) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1909455139 - 2³ = 1909455131 is a prime.

It is not a weakly prime, because it can be changed into another prime (1909455131) 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, 954727569 + 954727570.

It is an arithmetic number, because the mean of its divisors is an integer number (954727570).

Almost surely, 2^1909455139 is an apocalyptic number.

1909455139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1909455139 is an equidigital number, since it uses as much as digits as its factorization.

1909455139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 218700, while the sum is 46.

The square root of 1909455139 is about 43697.3127205781. The cubic root of 1909455139 is about 1240.6134536158.

The spelling of 1909455139 in words is "one billion, nine hundred nine million, four hundred fifty-five thousand, one hundred thirty-nine".