1216226626 has 4 divisors (see below), whose sum is σ = 1824339942. Its totient is φ = 608113312.

The previous prime is 1216226579. The next prime is 1216226701. The reversal of 1216226626 is 6266226121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6266226121 = 67 ⋅93525763.

It can be written as a sum of positive squares in only one way, i.e., 1144807225 + 71419401 = 33835^2 + 8451^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1216226591 and 1216226600.

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, 304056655 + ... + 304056658.

Almost surely, 2^1216226626 is an apocalyptic number.

1216226626 is a deficient number, since it is larger than the sum of its proper divisors (608113316).

1216226626 is an equidigital number, since it uses as much as digits as its factorization.

1216226626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608113315.

The product of its digits is 20736, while the sum is 34.

The square root of 1216226626 is about 34874.4408700699. The cubic root of 1216226626 is about 1067.4269633954.

The spelling of 1216226626 in words is "one billion, two hundred sixteen million, two hundred twenty-six thousand, six hundred twenty-six".