1279727972489 has 2 divisors, whose sum is σ = 1279727972490. Its totient is φ = 1279727972488.

The previous prime is 1279727972401. The next prime is 1279727972519. The reversal of 1279727972489 is 9842797279721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1194649000000 + 85078972489 = 1093000^2 + 291683^2 .

It is a cyclic number.

It is not a de Polignac number, because 1279727972489 - 2⁸ = 1279727972233 is a prime.

It is not a weakly prime, because it can be changed into another prime (1279723972489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639863986244 + 639863986245.

It is an arithmetic number, because the mean of its divisors is an integer number (639863986245).

Almost surely, 2^{1279727972489} is an apocalyptic number.

It is an amenable number.

1279727972489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1279727972489 is an equidigital number, since it uses as much as digits as its factorization.

1279727972489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 448084224, while the sum is 74.

The spelling of 1279727972489 in words is "one trillion, two hundred seventy-nine billion, seven hundred twenty-seven million, nine hundred seventy-two thousand, four hundred eighty-nine".