1228925917 has 2 divisors, whose sum is σ = 1228925918. Its totient is φ = 1228925916.

The previous prime is 1228925891. The next prime is 1228925933. The reversal of 1228925917 is 7195298221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1176421401 + 52504516 = 34299^2 + 7246^2 .

It is a cyclic number.

It is not a de Polignac number, because 1228925917 - 2²³ = 1220537309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1228925987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614462958 + 614462959.

It is an arithmetic number, because the mean of its divisors is an integer number (614462959).

Almost surely, 2^1228925917 is an apocalyptic number.

It is an amenable number.

1228925917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228925917 is an equidigital number, since it uses as much as digits as its factorization.

1228925917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 181440, while the sum is 46.

The square root of 1228925917 is about 35056.0396650848. The cubic root of 1228925917 is about 1071.1293043805.

The spelling of 1228925917 in words is "one billion, two hundred twenty-eight million, nine hundred twenty-five thousand, nine hundred seventeen".