1212172648 has 16 divisors (see below), whose sum is σ = 2276665380. Its totient is φ = 605061888.

The previous prime is 1212172639. The next prime is 1212172649. The reversal of 1212172648 is 8462712121.

It can be written as a sum of positive squares in 2 ways, for example, as 1176627204 + 35545444 = 34302^2 + 5962^2 .

It is not an unprimeable number, because it can be changed into a prime (1212172649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123015 + ... + 132502.

Almost surely, 2^1212172648 is an apocalyptic number.

It is an amenable number.

1212172648 is a deficient number, since it is larger than the sum of its proper divisors (1064492732).

1212172648 is a wasteful number, since it uses less digits than its factorization.

1212172648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256116 (or 256112 counting only the distinct ones).

The product of its digits is 10752, while the sum is 34.

The square root of 1212172648 is about 34816.2698748732. The cubic root of 1212172648 is about 1066.2396456524.

Adding to 1212172648 its reverse (8462712121), we get a palindrome (9674884769).

The spelling of 1212172648 in words is "one billion, two hundred twelve million, one hundred seventy-two thousand, six hundred forty-eight".