1225405556 has 24 divisors (see below), whose sum is σ = 2219805000. Its totient is φ = 591202304.

The previous prime is 1225405549. The next prime is 1225405607. The reversal of 1225405556 is 6555045221.

It can be written as a sum of positive squares in 4 ways, for example, as 81613156 + 1143792400 = 9034^2 + 33820^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 300620 + ... + 304668.

It is an arithmetic number, because the mean of its divisors is an integer number (92491875).

Almost surely, 2^1225405556 is an apocalyptic number.

It is an amenable number.

1225405556 is a deficient number, since it is larger than the sum of its proper divisors (994399444).

1225405556 is a wasteful number, since it uses less digits than its factorization.

1225405556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6691 (or 6689 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 35.

The square root of 1225405556 is about 35005.7931777013. The cubic root of 1225405556 is about 1070.1055464056.

The spelling of 1225405556 in words is "one billion, two hundred twenty-five million, four hundred five thousand, five hundred fifty-six".