1228877917 has 2 divisors, whose sum is σ = 1228877918. Its totient is φ = 1228877916.

The previous prime is 1228877843. The next prime is 1228877921. The reversal of 1228877917 is 7197788221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1141155961 + 87721956 = 33781^2 + 9366^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1228877917 is a prime.

It is a super-3 number, since 3×1228877917³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1228877717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614438958 + 614438959.

It is an arithmetic number, because the mean of its divisors is an integer number (614438959).

Almost surely, 2^1228877917 is an apocalyptic number.

It is an amenable number.

1228877917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228877917 is an equidigital number, since it uses as much as digits as its factorization.

1228877917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 790272, while the sum is 52.

The square root of 1228877917 is about 35055.3550402788. The cubic root of 1228877917 is about 1071.1153586318.

The spelling of 1228877917 in words is "one billion, two hundred twenty-eight million, eight hundred seventy-seven thousand, nine hundred seventeen".