1228811687 has 2 divisors, whose sum is σ = 1228811688. Its totient is φ = 1228811686.

The previous prime is 1228811677. The next prime is 1228811707. The reversal of 1228811687 is 7861188221.

It is a weak prime.

It is an emirp because it is prime and its reverse (7861188221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1228811687 - 2⁴ = 1228811671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1228811657) 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, 614405843 + 614405844.

It is an arithmetic number, because the mean of its divisors is an integer number (614405844).

Almost surely, 2^1228811687 is an apocalyptic number.

1228811687 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228811687 is an equidigital number, since it uses as much as digits as its factorization.

1228811687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86016, while the sum is 44.

The square root of 1228811687 is about 35054.4103787241. The cubic root of 1228811687 is about 1071.0961158077.

The spelling of 1228811687 in words is "one billion, two hundred twenty-eight million, eight hundred eleven thousand, six hundred eighty-seven".