1919810947 has 2 divisors, whose sum is σ = 1919810948. Its totient is φ = 1919810946.

The previous prime is 1919810917. The next prime is 1919810957. The reversal of 1919810947 is 7490189191.

It is a strong prime.

It is an emirp because it is prime and its reverse (7490189191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1919810947 - 2¹⁹ = 1919286659 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1919810947.

It is not a weakly prime, because it can be changed into another prime (1919810917) 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, 959905473 + 959905474.

It is an arithmetic number, because the mean of its divisors is an integer number (959905474).

Almost surely, 2^1919810947 is an apocalyptic number.

1919810947 is a deficient number, since it is larger than the sum of its proper divisors (1).

1919810947 is an equidigital number, since it uses as much as digits as its factorization.

1919810947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 49.

The square root of 1919810947 is about 43815.6472849597. The cubic root of 1919810947 is about 1242.8522071796.

The spelling of 1919810947 in words is "one billion, nine hundred nineteen million, eight hundred ten thousand, nine hundred forty-seven".