1979347849 has 2 divisors, whose sum is σ = 1979347850. Its totient is φ = 1979347848.

The previous prime is 1979347793. The next prime is 1979347873. The reversal of 1979347849 is 9487439791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1568556025 + 410791824 = 39605^2 + 20268^2 .

It is an emirp because it is prime and its reverse (9487439791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1979347849 - 2¹¹ = 1979345801 is a prime.

It is not a weakly prime, because it can be changed into another prime (1979347549) 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, 989673924 + 989673925.

It is an arithmetic number, because the mean of its divisors is an integer number (989673925).

Almost surely, 2^1979347849 is an apocalyptic number.

It is an amenable number.

1979347849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1979347849 is an equidigital number, since it uses as much as digits as its factorization.

1979347849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13716864, while the sum is 61.

The square root of 1979347849 is about 44489.8623171616. The cubic root of 1979347849 is about 1255.5693567459.

The spelling of 1979347849 in words is "one billion, nine hundred seventy-nine million, three hundred forty-seven thousand, eight hundred forty-nine".