1974581048549 has 2 divisors, whose sum is σ = 1974581048550. Its totient is φ = 1974581048548.

The previous prime is 1974581048533. The next prime is 1974581048581. The reversal of 1974581048549 is 9458401854791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1771534380100 + 203046668449 = 1330990^2 + 450607^2 .

It is an emirp because it is prime and its reverse (9458401854791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1974581048549 - 2⁴ = 1974581048533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1974581048599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 987290524274 + 987290524275.

It is an arithmetic number, because the mean of its divisors is an integer number (987290524275).

Almost surely, 2^{1974581048549} is an apocalyptic number.

It is an amenable number.

1974581048549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1974581048549 is an equidigital number, since it uses as much as digits as its factorization.

1974581048549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58060800, while the sum is 65.

The spelling of 1974581048549 in words is "one trillion, nine hundred seventy-four billion, five hundred eighty-one million, forty-eight thousand, five hundred forty-nine".