1288049779 has 2 divisors, whose sum is σ = 1288049780. Its totient is φ = 1288049778.

The previous prime is 1288049731. The next prime is 1288049797. The reversal of 1288049779 is 9779408821.

It is a happy number.

Together with next prime (1288049797) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1288049779 - 2²⁹ = 751178867 is a prime.

It is not a weakly prime, because it can be changed into another prime (1288049579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 644024889 + 644024890.

It is an arithmetic number, because the mean of its divisors is an integer number (644024890).

Almost surely, 2^1288049779 is an apocalyptic number.

1288049779 is a deficient number, since it is larger than the sum of its proper divisors (1).

1288049779 is an equidigital number, since it uses as much as digits as its factorization.

1288049779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2032128, while the sum is 55.

The square root of 1288049779 is about 35889.4104019556. The cubic root of 1288049779 is about 1088.0383816635.

The spelling of 1288049779 in words is "one billion, two hundred eighty-eight million, forty-nine thousand, seven hundred seventy-nine".