1225421608 has 16 divisors (see below), whose sum is σ = 2432822580. Its totient is φ = 576668928.

The previous prime is 1225421569. The next prime is 1225421627. The reversal of 1225421608 is 8061245221.

It can be written as a sum of positive squares in 2 ways, for example, as 1142575204 + 82846404 = 33802^2 + 9102^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1225421608.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4505091 + ... + 4505362.

Almost surely, 2^1225421608 is an apocalyptic number.

It is an amenable number.

1225421608 is a deficient number, since it is larger than the sum of its proper divisors (1207400972).

1225421608 is a wasteful number, since it uses less digits than its factorization.

1225421608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9010476 (or 9010472 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 1225421608 is about 35006.0224532865. The cubic root of 1225421608 is about 1070.1102189428.

Adding to 1225421608 its reverse (8061245221), we get a palindrome (9286666829).

The spelling of 1225421608 in words is "one billion, two hundred twenty-five million, four hundred twenty-one thousand, six hundred eight".