1228186825 has 6 divisors (see below), whose sum is σ = 1522951694. Its totient is φ = 982549440.

The previous prime is 1228186793. The next prime is 1228186829. The reversal of 1228186825 is 5286818221.

It can be written as a sum of positive squares in 3 ways, for example, as 200279104 + 1027907721 = 14152^2 + 32061^2 .

It is not a de Polignac number, because 1228186825 - 2⁵ = 1228186793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1228186829) 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 5 ways as a sum of consecutive naturals, for example, 24563712 + ... + 24563761.

Almost surely, 2^1228186825 is an apocalyptic number.

It is an amenable number.

1228186825 is a deficient number, since it is larger than the sum of its proper divisors (294764869).

1228186825 is an equidigital number, since it uses as much as digits as its factorization.

1228186825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49127483 (or 49127478 counting only the distinct ones).

The product of its digits is 122880, while the sum is 43.

The square root of 1228186825 is about 35045.4965009771. The cubic root of 1228186825 is about 1070.9145309627.

The spelling of 1228186825 in words is "one billion, two hundred twenty-eight million, one hundred eighty-six thousand, eight hundred twenty-five".