1123210381 has 2 divisors, whose sum is σ = 1123210382. Its totient is φ = 1123210380.

The previous prime is 1123210373. The next prime is 1123210393. The reversal of 1123210381 is 1830123211.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1095014281 + 28196100 = 33091^2 + 5310^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123210381 - 2³ = 1123210373 is a prime.

It is a super-2 number, since 2×1123210381² = 2523203119972330322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1123210481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 561605190 + 561605191.

It is an arithmetic number, because the mean of its divisors is an integer number (561605191).

Almost surely, 2^1123210381 is an apocalyptic number.

It is an amenable number.

1123210381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1123210381 is an equidigital number, since it uses as much as digits as its factorization.

1123210381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 1123210381 is about 33514.3309794482. The cubic root of 1123210381 is about 1039.4901288309.

Adding to 1123210381 its reverse (1830123211), we get a palindrome (2953333592).

The spelling of 1123210381 in words is "one billion, one hundred twenty-three million, two hundred ten thousand, three hundred eighty-one".