1947456911 has 2 divisors, whose sum is σ = 1947456912. Its totient is φ = 1947456910.

The previous prime is 1947456871. The next prime is 1947456937. The reversal of 1947456911 is 1196547491.

It is a strong prime.

It is an emirp because it is prime and its reverse (1196547491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1947456911 - 2²⁶ = 1880348047 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1947456311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 973728455 + 973728456.

It is an arithmetic number, because the mean of its divisors is an integer number (973728456).

Almost surely, 2^1947456911 is an apocalyptic number.

1947456911 is a deficient number, since it is larger than the sum of its proper divisors (1).

1947456911 is an equidigital number, since it uses as much as digits as its factorization.

1947456911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 47.

The square root of 1947456911 is about 44130.0001246318. Note that the first 3 decimals coincide. The cubic root of 1947456911 is about 1248.7896360736.

The spelling of 1947456911 in words is "one billion, nine hundred forty-seven million, four hundred fifty-six thousand, nine hundred eleven".