1228657369 has 2 divisors, whose sum is σ = 1228657370. Its totient is φ = 1228657368.

The previous prime is 1228657301. The next prime is 1228657403. The reversal of 1228657369 is 9637568221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1036002969 + 192654400 = 32187^2 + 13880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1228657369 is a prime.

It is a super-2 number, since 2×1228657369² = 3019197860796004322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1228657169) 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, 614328684 + 614328685.

It is an arithmetic number, because the mean of its divisors is an integer number (614328685).

Almost surely, 2^1228657369 is an apocalyptic number.

It is an amenable number.

1228657369 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228657369 is an equidigital number, since it uses as much as digits as its factorization.

1228657369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1088640, while the sum is 49.

The square root of 1228657369 is about 35052.2091885804. The cubic root of 1228657369 is about 1071.0512767349.

The spelling of 1228657369 in words is "one billion, two hundred twenty-eight million, six hundred fifty-seven thousand, three hundred sixty-nine".