1213664056 has 16 divisors (see below), whose sum is σ = 2482494840. Its totient is φ = 551665440.

The previous prime is 1213663987. The next prime is 1213664057. The reversal of 1213664056 is 6504663121.

It is a super-2 number, since 2×1213664056² = 2945960881652742272, which contains 22 as substring.

It is a zygodrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213664057) 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, 6895731 + ... + 6895906.

Almost surely, 2^1213664056 is an apocalyptic number.

It is an amenable number.

1213664056 is an abundant number, since it is smaller than the sum of its proper divisors (1268830784).

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

1213664056 is a wasteful number, since it uses less digits than its factorization.

1213664056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13791654 (or 13791650 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 1213664056 is about 34837.6815531688. The cubic root of 1213664056 is about 1066.6767524220.

The spelling of 1213664056 in words is "one billion, two hundred thirteen million, six hundred sixty-four thousand, fifty-six".