1849138409 has 2 divisors, whose sum is σ = 1849138410. Its totient is φ = 1849138408.

The previous prime is 1849138393. The next prime is 1849138471. The reversal of 1849138409 is 9048319481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1842813184 + 6325225 = 42928^2 + 2515^2 .

It is a cyclic number.

It is not a de Polignac number, because 1849138409 - 2⁴ = 1849138393 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1849131409) 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, 924569204 + 924569205.

It is an arithmetic number, because the mean of its divisors is an integer number (924569205).

Almost surely, 2^1849138409 is an apocalyptic number.

It is an amenable number.

1849138409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1849138409 is an equidigital number, since it uses as much as digits as its factorization.

1849138409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 47.

The square root of 1849138409 is about 43001.6093768594. The cubic root of 1849138409 is about 1227.4104218253.

The spelling of 1849138409 in words is "one billion, eight hundred forty-nine million, one hundred thirty-eight thousand, four hundred nine".