2251228609 has 12 divisors (see below), whose sum is σ = 2657866224. Its totient is φ = 1900821384.

The previous prime is 2251228549. The next prime is 2251228613. The reversal of 2251228609 is 9068221522.

It is not a de Polignac number, because 2251228609 - 2¹¹ = 2251226561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2251228669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 339579 + ... + 346144.

It is an arithmetic number, because the mean of its divisors is an integer number (221488852).

Almost surely, 2^2251228609 is an apocalyptic number.

It is an amenable number.

2251228609 is a deficient number, since it is larger than the sum of its proper divisors (406637615).

2251228609 is an equidigital number, since it uses as much as digits as its factorization.

2251228609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685804 (or 685797 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 2251228609 is about 47447.1138110634. The cubic root of 2251228609 is about 1310.6091623321.

It can be divided in two parts, 2251 and 228609, that added together give a triangular number (230860 = T₆₇₉).

The spelling of 2251228609 in words is "two billion, two hundred fifty-one million, two hundred twenty-eight thousand, six hundred nine".