1225222145 has 48 divisors (see below), whose sum is σ = 1763568000. Its totient is φ = 800305920.

The previous prime is 1225222129. The next prime is 1225222151. The reversal of 1225222145 is 5412225221.

It is not a de Polignac number, because 1225222145 - 2⁴ = 1225222129 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2455106 + ... + 2455604.

It is an arithmetic number, because the mean of its divisors is an integer number (36741000).

Almost surely, 2^1225222145 is an apocalyptic number.

It is an amenable number.

1225222145 is a deficient number, since it is larger than the sum of its proper divisors (538345855).

1225222145 is an equidigital number, since it uses as much as digits as its factorization.

1225222145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646 (or 615 counting only the distinct ones).

The product of its digits is 3200, while the sum is 26.

The square root of 1225222145 is about 35003.1733561402. The cubic root of 1225222145 is about 1070.0521548514.

Adding to 1225222145 its reverse (5412225221), we get a palindrome (6637447366).

The spelling of 1225222145 in words is "one billion, two hundred twenty-five million, two hundred twenty-two thousand, one hundred forty-five".