1228269217 has 4 divisors (see below), whose sum is σ = 1403736256. Its totient is φ = 1052802180.

The previous prime is 1228269199. The next prime is 1228269233. The reversal of 1228269217 is 7129628221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1228269217 - 2⁷ = 1228269089 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1228269217.

It is not an unprimeable number, because it can be changed into a prime (1228264217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87733509 + ... + 87733522.

It is an arithmetic number, because the mean of its divisors is an integer number (350934064).

Almost surely, 2^1228269217 is an apocalyptic number.

It is an amenable number.

1228269217 is a deficient number, since it is larger than the sum of its proper divisors (175467039).

1228269217 is an equidigital number, since it uses as much as digits as its factorization.

1228269217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175467038.

The product of its digits is 48384, while the sum is 40.

The square root of 1228269217 is about 35046.6719818016. The cubic root of 1228269217 is about 1070.9384775955.

The spelling of 1228269217 in words is "one billion, two hundred twenty-eight million, two hundred sixty-nine thousand, two hundred seventeen".