1228651813 has 16 divisors (see below), whose sum is σ = 1274382720. Its totient is φ = 1183896000.

The previous prime is 1228651811. The next prime is 1228651841. The reversal of 1228651813 is 3181568221.

It is a cyclic number.

It is not a de Polignac number, because 1228651813 - 2¹ = 1228651811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228651811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1752363 + ... + 1753063.

It is an arithmetic number, because the mean of its divisors is an integer number (79648920).

Almost surely, 2^1228651813 is an apocalyptic number.

It is an amenable number.

1228651813 is a deficient number, since it is larger than the sum of its proper divisors (45730907).

1228651813 is an equidigital number, since it uses as much as digits as its factorization.

1228651813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1308.

The product of its digits is 23040, while the sum is 37.

The square root of 1228651813 is about 35052.1299352835. The cubic root of 1228651813 is about 1071.0496622979.

The spelling of 1228651813 in words is "one billion, two hundred twenty-eight million, six hundred fifty-one thousand, eight hundred thirteen".