1229755861 has 2 divisors, whose sum is σ = 1229755862. Its totient is φ = 1229755860.

The previous prime is 1229755853. The next prime is 1229755907. The reversal of 1229755861 is 1685579221.

It is an a-pointer prime, because the next prime (1229755907) can be obtained adding 1229755861 to its sum of digits (46).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 991053361 + 238702500 = 31481^2 + 15450^2 .

It is an emirp because it is prime and its reverse (1685579221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1229755861 - 2³ = 1229755853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1229755561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614877930 + 614877931.

It is an arithmetic number, because the mean of its divisors is an integer number (614877931).

Almost surely, 2^1229755861 is an apocalyptic number.

It is an amenable number.

1229755861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1229755861 is an equidigital number, since it uses as much as digits as its factorization.

1229755861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 46.

The square root of 1229755861 is about 35067.8750568095. The cubic root of 1229755861 is about 1071.3703759485.

The spelling of 1229755861 in words is "one billion, two hundred twenty-nine million, seven hundred fifty-five thousand, eight hundred sixty-one".