1913820709 has 2 divisors, whose sum is σ = 1913820710. Its totient is φ = 1913820708.

The previous prime is 1913820707. The next prime is 1913820721. The reversal of 1913820709 is 9070283191.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1480556484 + 433264225 = 38478^2 + 20815^2 .

It is a cyclic number.

It is not a de Polignac number, because 1913820709 - 2¹ = 1913820707 is a prime.

Together with 1913820707, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1913820703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 956910354 + 956910355.

It is an arithmetic number, because the mean of its divisors is an integer number (956910355).

Almost surely, 2^1913820709 is an apocalyptic number.

It is an amenable number.

1913820709 is a deficient number, since it is larger than the sum of its proper divisors (1).

1913820709 is an equidigital number, since it uses as much as digits as its factorization.

1913820709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 1913820709 is about 43747.2365870120. The cubic root of 1913820709 is about 1241.5582017611.

The spelling of 1913820709 in words is "one billion, nine hundred thirteen million, eight hundred twenty thousand, seven hundred nine".