1225205672 has 8 divisors (see below), whose sum is σ = 2297260650. Its totient is φ = 612602832.

The previous prime is 1225205669. The next prime is 1225205701. The reversal of 1225205672 is 2765025221.

It can be written as a sum of positive squares in only one way, i.e., 1164583876 + 60621796 = 34126^2 + 7786^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×1225205672² = 3002257877401943168, which contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 76575347 + ... + 76575362.

Almost surely, 2^1225205672 is an apocalyptic number.

It is an amenable number.

1225205672 is a deficient number, since it is larger than the sum of its proper divisors (1072054978).

1225205672 is a wasteful number, since it uses less digits than its factorization.

1225205672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153150715 (or 153150711 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 1225205672 is about 35002.9380481125. The cubic root of 1225205672 is about 1070.0473592454.

The spelling of 1225205672 in words is "one billion, two hundred twenty-five million, two hundred five thousand, six hundred seventy-two".