1213566443 has 2 divisors, whose sum is σ = 1213566444. Its totient is φ = 1213566442.

The previous prime is 1213566379. The next prime is 1213566463. The reversal of 1213566443 is 3446653121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1213566443 - 2⁶ = 1213566379 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1213566463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606783221 + 606783222.

It is an arithmetic number, because the mean of its divisors is an integer number (606783222).

Almost surely, 2^1213566443 is an apocalyptic number.

1213566443 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213566443 is an equidigital number, since it uses as much as digits as its factorization.

1213566443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 35.

The square root of 1213566443 is about 34836.2805563395. The cubic root of 1213566443 is about 1066.6481546375.

The spelling of 1213566443 in words is "one billion, two hundred thirteen million, five hundred sixty-six thousand, four hundred forty-three".