1123982381 has 4 divisors (see below), whose sum is σ = 1124131932. Its totient is φ = 1123832832.

The previous prime is 1123982371. The next prime is 1123982389. The reversal of 1123982381 is 1832893211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 888636100 + 235346281 = 29810^2 + 15341^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123982381 - 2¹⁸ = 1123720237 is a prime.

It is a super-2 number, since 2×1123982381² = 2526672785596858322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123982389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62870 + ... + 78743.

It is an arithmetic number, because the mean of its divisors is an integer number (281032983).

Almost surely, 2^1123982381 is an apocalyptic number.

It is an amenable number.

1123982381 is a deficient number, since it is larger than the sum of its proper divisors (149551).

1123982381 is an equidigital number, since it uses as much as digits as its factorization.

1123982381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149550.

The product of its digits is 20736, while the sum is 38.

The square root of 1123982381 is about 33525.8464620955. The cubic root of 1123982381 is about 1039.7282268784.

The spelling of 1123982381 in words is "one billion, one hundred twenty-three million, nine hundred eighty-two thousand, three hundred eighty-one".