1225917128 has 12 divisors (see below), whose sum is σ = 2298780315. Its totient is φ = 612909048.

The previous prime is 1225917079. The next prime is 1225917131. The reversal of 1225917128 is 8217195221.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 612958564 + 612958564 = 24758^2 + 24758^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=24758.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1225917091 and 1225917100.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 92843 + ... + 105221.

Almost surely, 2^1225917128 is an apocalyptic number.

It is an amenable number.

1225917128 is a deficient number, since it is larger than the sum of its proper divisors (1072863187).

1225917128 is an frugal number, since it uses more digits than its factorization.

1225917128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24764 (or 12381 counting only the distinct ones).

The product of its digits is 20160, while the sum is 38.

The square root of 1225917128 is about 35013.0993772331. The cubic root of 1225917128 is about 1070.2544385744.

The spelling of 1225917128 in words is "one billion, two hundred twenty-five million, nine hundred seventeen thousand, one hundred twenty-eight".