1213333556689 has 4 divisors (see below), whose sum is σ = 1222595645040. Its totient is φ = 1204071468340.

The previous prime is 1213333556671. The next prime is 1213333556693. The reversal of 1213333556689 is 9866553333121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1213333556689 - 2⁵ = 1213333556657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1213333556609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4631043979 + ... + 4631044240.

It is an arithmetic number, because the mean of its divisors is an integer number (305648911260).

Almost surely, 2^{1213333556689} is an apocalyptic number.

It is an amenable number.

1213333556689 is a deficient number, since it is larger than the sum of its proper divisors (9262088351).

1213333556689 is an equidigital number, since it uses as much as digits as its factorization.

1213333556689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9262088350.

The product of its digits is 10497600, while the sum is 55.

The spelling of 1213333556689 in words is "one trillion, two hundred thirteen billion, three hundred thirty-three million, five hundred fifty-six thousand, six hundred eighty-nine".