1949547979 has 2 divisors, whose sum is σ = 1949547980. Its totient is φ = 1949547978.

The previous prime is 1949547911. The next prime is 1949548021. The reversal of 1949547979 is 9797459491.

It is a strong prime.

It is an emirp because it is prime and its reverse (9797459491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1949547979 - 2⁷ = 1949547851 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1949547979.

It is not a weakly prime, because it can be changed into another prime (1949547179) 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, 974773989 + 974773990.

It is an arithmetic number, because the mean of its divisors is an integer number (974773990).

Almost surely, 2^1949547979 is an apocalyptic number.

1949547979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1949547979 is an equidigital number, since it uses as much as digits as its factorization.

1949547979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25719120, while the sum is 64.

The square root of 1949547979 is about 44153.6859050295. The cubic root of 1949547979 is about 1249.2364358575.

The spelling of 1949547979 in words is "one billion, nine hundred forty-nine million, five hundred forty-seven thousand, nine hundred seventy-nine".