1228228791 has 16 divisors (see below), whose sum is σ = 1667192448. Its totient is φ = 804117600.

The previous prime is 1228228789. The next prime is 1228228817. The reversal of 1228228791 is 1978228221.

It is not a de Polignac number, because 1228228791 - 2¹ = 1228228789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228228691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57301 + ... + 75761.

It is an arithmetic number, because the mean of its divisors is an integer number (104199528).

Almost surely, 2^1228228791 is an apocalyptic number.

1228228791 is a deficient number, since it is larger than the sum of its proper divisors (438963657).

1228228791 is a wasteful number, since it uses less digits than its factorization.

1228228791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18862.

The product of its digits is 64512, while the sum is 42.

The square root of 1228228791 is about 35046.0952318514. The cubic root of 1228228791 is about 1070.9267282078.

The spelling of 1228228791 in words is "one billion, two hundred twenty-eight million, two hundred twenty-eight thousand, seven hundred ninety-one".