1228851109 has 2 divisors, whose sum is σ = 1228851110. Its totient is φ = 1228851108.

The previous prime is 1228851101. The next prime is 1228851149. The reversal of 1228851109 is 9011588221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 658692225 + 570158884 = 25665^2 + 23878^2 .

It is a cyclic number.

It is not a de Polignac number, because 1228851109 - 2³ = 1228851101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1228851101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614425554 + 614425555.

It is an arithmetic number, because the mean of its divisors is an integer number (614425555).

Almost surely, 2^1228851109 is an apocalyptic number.

It is an amenable number.

1228851109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228851109 is an equidigital number, since it uses as much as digits as its factorization.

1228851109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 37.

The square root of 1228851109 is about 35054.9726715055. The cubic root of 1228851109 is about 1071.1075697731.

The spelling of 1228851109 in words is "one billion, two hundred twenty-eight million, eight hundred fifty-one thousand, one hundred nine".