1225565649 has 96 divisors (see below), whose sum is σ = 2439051264. Its totient is φ = 573027840.

The previous prime is 1225565639. The next prime is 1225565669. The reversal of 1225565649 is 9465655221.

1225565649 is a `hidden beast` number, since 1 + 2 + 2 + 556 + 56 + 49 = 666.

It is not a de Polignac number, because 1225565649 - 2⁵ = 1225565617 is a prime.

It is a super-2 number, since 2×1225565649² = 3004022320017582402, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1225565639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 268702 + ... + 273224.

It is an arithmetic number, because the mean of its divisors is an integer number (25406784).

Almost surely, 2^1225565649 is an apocalyptic number.

It is an amenable number.

1225565649 is a deficient number, since it is larger than the sum of its proper divisors (1213485615).

1225565649 is a wasteful number, since it uses less digits than its factorization.

1225565649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4587 (or 4584 counting only the distinct ones).

The product of its digits is 648000, while the sum is 45.

The square root of 1225565649 is about 35008.0797673908. The cubic root of 1225565649 is about 1070.1521456577.

The spelling of 1225565649 in words is "one billion, two hundred twenty-five million, five hundred sixty-five thousand, six hundred forty-nine".