1221563183 has 2 divisors, whose sum is σ = 1221563184. Its totient is φ = 1221563182.

The previous prime is 1221563159. The next prime is 1221563249. The reversal of 1221563183 is 3813651221.

It is a weak prime.

It is an emirp because it is prime and its reverse (3813651221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221563183 - 2¹⁶ = 1221497647 is a prime.

It is a super-2 number, since 2×1221563183² = 2984433220122182978, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221563383) 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, 610781591 + 610781592.

It is an arithmetic number, because the mean of its divisors is an integer number (610781592).

Almost surely, 2^1221563183 is an apocalyptic number.

1221563183 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221563183 is an equidigital number, since it uses as much as digits as its factorization.

1221563183 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 32.

The square root of 1221563183 is about 34950.8681294185. The cubic root of 1221563183 is about 1068.9859035449.

The spelling of 1221563183 in words is "one billion, two hundred twenty-one million, five hundred sixty-three thousand, one hundred eighty-three".