1288155109 has 2 divisors, whose sum is σ = 1288155110. Its totient is φ = 1288155108.

The previous prime is 1288155101. The next prime is 1288155149. The reversal of 1288155109 is 9015518821.

It is an a-pointer prime, because the next prime (1288155149) can be obtained adding 1288155109 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1268926884 + 19228225 = 35622^2 + 4385^2 .

It is a cyclic number.

It is not a de Polignac number, because 1288155109 - 2³ = 1288155101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1288155101) 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, 644077554 + 644077555.

It is an arithmetic number, because the mean of its divisors is an integer number (644077555).

Almost surely, 2^1288155109 is an apocalyptic number.

It is an amenable number.

1288155109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1288155109 is an equidigital number, since it uses as much as digits as its factorization.

1288155109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 40.

The square root of 1288155109 is about 35890.8777964541. The cubic root of 1288155109 is about 1088.0680388918.

The spelling of 1288155109 in words is "one billion, two hundred eighty-eight million, one hundred fifty-five thousand, one hundred nine".