1216564548 has 12 divisors (see below), whose sum is σ = 2838650640. Its totient is φ = 405521512.

The previous prime is 1216564519. The next prime is 1216564549. The reversal of 1216564548 is 8454656121.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (1216564549) 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 in 3 ways as a sum of consecutive naturals, for example, 50690178 + ... + 50690201.

It is an arithmetic number, because the mean of its divisors is an integer number (236554220).

Almost surely, 2^1216564548 is an apocalyptic number.

It is an amenable number.

1216564548 is an abundant number, since it is smaller than the sum of its proper divisors (1622086092).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1216564548 is a wasteful number, since it uses less digits than its factorization.

1216564548 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101380386 (or 101380384 counting only the distinct ones).

The product of its digits is 230400, while the sum is 42.

The square root of 1216564548 is about 34879.2853711196. The cubic root of 1216564548 is about 1067.5258138467.

The spelling of 1216564548 in words is "one billion, two hundred sixteen million, five hundred sixty-four thousand, five hundred forty-eight".