1999079276549 has 2 divisors, whose sum is σ = 1999079276550. Its totient is φ = 1999079276548.

The previous prime is 1999079276539. The next prime is 1999079276627. The reversal of 1999079276549 is 9456729709991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1985261274049 + 13818002500 = 1408993^2 + 117550^2 .

It is a cyclic number.

It is not a de Polignac number, because 1999079276549 - 2²⁰ = 1999078227973 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1999079276549.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1999079276539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999539638274 + 999539638275.

It is an arithmetic number, because the mean of its divisors is an integer number (999539638275).

Almost surely, 2^{1999079276549} is an apocalyptic number.

It is an amenable number.

1999079276549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999079276549 is an equidigital number, since it uses as much as digits as its factorization.

1999079276549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 694416240, while the sum is 77.

The spelling of 1999079276549 in words is "one trillion, nine hundred ninety-nine billion, seventy-nine million, two hundred seventy-six thousand, five hundred forty-nine".