1225056442 has 4 divisors (see below), whose sum is σ = 1837584666. Its totient is φ = 612528220.

The previous prime is 1225056403. The next prime is 1225056451. The reversal of 1225056442 is 2446505221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2446505221 = 29 ⋅84362249.

It can be written as a sum of positive squares in only one way, i.e., 1083660561 + 141395881 = 32919^2 + 11891^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306264109 + ... + 306264112.

Almost surely, 2^1225056442 is an apocalyptic number.

1225056442 is a deficient number, since it is larger than the sum of its proper divisors (612528224).

1225056442 is an equidigital number, since it uses as much as digits as its factorization.

1225056442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612528223.

The product of its (nonzero) digits is 19200, while the sum is 31.

The square root of 1225056442 is about 35000.8063049982. The cubic root of 1225056442 is about 1070.0039135735.

The spelling of 1225056442 in words is "one billion, two hundred twenty-five million, fifty-six thousand, four hundred forty-two".