1227645823 has 2 divisors, whose sum is σ = 1227645824. Its totient is φ = 1227645822.

The previous prime is 1227645817. The next prime is 1227645833. The reversal of 1227645823 is 3285467221.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1227645823 is a prime.

It is a super-2 number, since 2×1227645823² = 3014228533458694658, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1227645833) 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 as a sum of consecutive naturals, namely, 613822911 + 613822912.

It is an arithmetic number, because the mean of its divisors is an integer number (613822912).

Almost surely, 2^1227645823 is an apocalyptic number.

1227645823 is a deficient number, since it is larger than the sum of its proper divisors (1).

1227645823 is an equidigital number, since it uses as much as digits as its factorization.

1227645823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 40.

The square root of 1227645823 is about 35037.7770841702. Note that the first 3 decimals coincide. The cubic root of 1227645823 is about 1070.7572660742.

The spelling of 1227645823 in words is "one billion, two hundred twenty-seven million, six hundred forty-five thousand, eight hundred twenty-three".