1221198163 has 2 divisors, whose sum is σ = 1221198164. Its totient is φ = 1221198162.

The previous prime is 1221198137. The next prime is 1221198193. The reversal of 1221198163 is 3618911221.

It is a weak prime.

It is an emirp because it is prime and its reverse (3618911221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1221198163 - 2²⁹ = 684327251 is a prime.

It is not a weakly prime, because it can be changed into another prime (1221198193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610599081 + 610599082.

It is an arithmetic number, because the mean of its divisors is an integer number (610599082).

Almost surely, 2^1221198163 is an apocalyptic number.

1221198163 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221198163 is an equidigital number, since it uses as much as digits as its factorization.

1221198163 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 34.

The square root of 1221198163 is about 34945.6458375003. The cubic root of 1221198163 is about 1068.8794170059.

The spelling of 1221198163 in words is "one billion, two hundred twenty-one million, one hundred ninety-eight thousand, one hundred sixty-three".