1228516906 has 4 divisors (see below), whose sum is σ = 1842775362. Its totient is φ = 614258452.

The previous prime is 1228516901. The next prime is 1228516909. The reversal of 1228516906 is 6096158221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6096158221 = 37 ⋅164761033.

It can be written as a sum of positive squares in only one way, i.e., 791915881 + 436601025 = 28141^2 + 20895^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1228516901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307129225 + ... + 307129228.

Almost surely, 2^1228516906 is an apocalyptic number.

1228516906 is a deficient number, since it is larger than the sum of its proper divisors (614258456).

1228516906 is an equidigital number, since it uses as much as digits as its factorization.

1228516906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614258455.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 1228516906 is about 35050.2055058169. The cubic root of 1228516906 is about 1071.0104601458.

The spelling of 1228516906 in words is "one billion, two hundred twenty-eight million, five hundred sixteen thousand, nine hundred six".