1948836809 has 2 divisors, whose sum is σ = 1948836810. Its totient is φ = 1948836808.

The previous prime is 1948836749. The next prime is 1948836817. The reversal of 1948836809 is 9086388491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1337511184 + 611325625 = 36572^2 + 24725^2 .

It is a cyclic number.

It is not a de Polignac number, because 1948836809 - 2¹⁶ = 1948771273 is a prime.

It is a super-2 number, since 2×1948836809² = 7595929816226604962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1948836889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 974418404 + 974418405.

It is an arithmetic number, because the mean of its divisors is an integer number (974418405).

Almost surely, 2^1948836809 is an apocalyptic number.

It is an amenable number.

1948836809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1948836809 is an equidigital number, since it uses as much as digits as its factorization.

1948836809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2985984, while the sum is 56.

The square root of 1948836809 is about 44145.6318224125. The cubic root of 1948836809 is about 1249.0845155943.

The spelling of 1948836809 in words is "one billion, nine hundred forty-eight million, eight hundred thirty-six thousand, eight hundred nine".