1228748165 has 4 divisors (see below), whose sum is σ = 1474497804. Its totient is φ = 982998528.

The previous prime is 1228748111. The next prime is 1228748189. The reversal of 1228748165 is 5618478221.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 722588161 + 506160004 = 26881^2 + 22498^2 .

It is a cyclic number.

It is not a de Polignac number, because 1228748165 - 2²⁸ = 960312709 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122874812 + ... + 122874821.

It is an arithmetic number, because the mean of its divisors is an integer number (368624451).

Almost surely, 2^1228748165 is an apocalyptic number.

It is an amenable number.

1228748165 is a deficient number, since it is larger than the sum of its proper divisors (245749639).

1228748165 is an equidigital number, since it uses as much as digits as its factorization.

1228748165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245749638.

The product of its digits is 215040, while the sum is 44.

The square root of 1228748165 is about 35053.5043183988. The cubic root of 1228748165 is about 1071.0776591311.

The spelling of 1228748165 in words is "one billion, two hundred twenty-eight million, seven hundred forty-eight thousand, one hundred sixty-five".