1220557163 has 4 divisors (see below), whose sum is σ = 1394922480. Its totient is φ = 1046191848.

The previous prime is 1220557159. The next prime is 1220557201. The reversal of 1220557163 is 3617550221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3617550221 = 1123 ⋅3221327.

It is a cyclic number.

It is not a de Polignac number, because 1220557163 - 2² = 1220557159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1220557363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87182648 + ... + 87182661.

It is an arithmetic number, because the mean of its divisors is an integer number (348730620).

Almost surely, 2^1220557163 is an apocalyptic number.

1220557163 is a deficient number, since it is larger than the sum of its proper divisors (174365317).

1220557163 is an equidigital number, since it uses as much as digits as its factorization.

1220557163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174365316.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 1220557163 is about 34936.4732478824. The cubic root of 1220557163 is about 1068.6923680241.

The spelling of 1220557163 in words is "one billion, two hundred twenty million, five hundred fifty-seven thousand, one hundred sixty-three".