1228956787 has 2 divisors, whose sum is σ = 1228956788. Its totient is φ = 1228956786.

The previous prime is 1228956779. The next prime is 1228956793. The reversal of 1228956787 is 7876598221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1228956787 - 2³ = 1228956779 is a prime.

It is a super-6 number, since 6×1228956787⁶ (a number of 56 digits) contains 666666 as substring. Note that it is a super-d number also for d = 4.

It is not a weakly prime, because it can be changed into another prime (1228956737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614478393 + 614478394.

It is an arithmetic number, because the mean of its divisors is an integer number (614478394).

Almost surely, 2^1228956787 is an apocalyptic number.

1228956787 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228956787 is an equidigital number, since it uses as much as digits as its factorization.

1228956787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3386880, while the sum is 55.

The square root of 1228956787 is about 35056.4799573488. The cubic root of 1228956787 is about 1071.1382730482.

The spelling of 1228956787 in words is "one billion, two hundred twenty-eight million, nine hundred fifty-six thousand, seven hundred eighty-seven".