1222218581 has 2 divisors, whose sum is σ = 1222218582. Its totient is φ = 1222218580.

The previous prime is 1222218533. The next prime is 1222218611. The reversal of 1222218581 is 1858122221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1195084900 + 27133681 = 34570^2 + 5209^2 .

It is an emirp because it is prime and its reverse (1858122221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1222218581 - 2²⁶ = 1155109717 is a prime.

It is a super-2 number, since 2×1222218581² = 2987636519483307122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1222518581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611109290 + 611109291.

It is an arithmetic number, because the mean of its divisors is an integer number (611109291).

Almost surely, 2^1222218581 is an apocalyptic number.

It is an amenable number.

1222218581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222218581 is an equidigital number, since it uses as much as digits as its factorization.

1222218581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5120, while the sum is 32.

The square root of 1222218581 is about 34960.2428624287. The cubic root of 1222218581 is about 1069.1770482389.

It can be divided in two parts, 122221 and 8581, that multiplied together give a palindrome (1048778401).

The spelling of 1222218581 in words is "one billion, two hundred twenty-two million, two hundred eighteen thousand, five hundred eighty-one".