1228643425 has 6 divisors (see below), whose sum is σ = 1523517878. Its totient is φ = 982914720.

The previous prime is 1228643413. The next prime is 1228643441. The reversal of 1228643425 is 5243468221.

It can be written as a sum of positive squares in 3 ways, for example, as 285170769 + 943472656 = 16887^2 + 30716^2 .

It is not a de Polignac number, because 1228643425 - 2¹⁷ = 1228512353 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24572844 + ... + 24572893.

Almost surely, 2^1228643425 is an apocalyptic number.

It is an amenable number.

1228643425 is a deficient number, since it is larger than the sum of its proper divisors (294874453).

1228643425 is an equidigital number, since it uses as much as digits as its factorization.

1228643425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49145747 (or 49145742 counting only the distinct ones).

The product of its digits is 92160, while the sum is 37.

The square root of 1228643425 is about 35052.0102847183. The cubic root of 1228643425 is about 1071.0472249421.

The spelling of 1228643425 in words is "one billion, two hundred twenty-eight million, six hundred forty-three thousand, four hundred twenty-five".