1213307056 has 20 divisors (see below), whose sum is σ = 2531612272. Its totient is φ = 559987776.

The previous prime is 1213307027. The next prime is 1213307077. The reversal of 1213307056 is 6507033121.

It is a super-2 number, since 2×1213307056² = 2944228024278774272, which contains 22 as substring.

It is an unprimeable number.

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, 2916396 + ... + 2916811.

Almost surely, 2^1213307056 is an apocalyptic number.

1213307056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1213307056 is an abundant number, since it is smaller than the sum of its proper divisors (1318305216).

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

1213307056 is a wasteful number, since it uses less digits than its factorization.

1213307056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5833228 (or 5833222 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 28.

The square root of 1213307056 is about 34832.5574140057. The cubic root of 1213307056 is about 1066.5721542996.

The spelling of 1213307056 in words is "one billion, two hundred thirteen million, three hundred seven thousand, fifty-six".