1123131402 has 24 divisors (see below), whose sum is σ = 2442247236. Its totient is φ = 373023936.

The previous prime is 1123131389. The next prime is 1123131403. The reversal of 1123131402 is 2041313211.

1123131402 is a `hidden beast` number, since 1 + 1 + 231 + 31 + 402 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 902341521 + 220789881 = 30039^2 + 14859^2 .

It is a super-2 number, since 2×1123131402² = 2522848292316971208, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1123131403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 107643 + ... + 117614.

Almost surely, 2^1123131402 is an apocalyptic number.

1123131402 is an abundant number, since it is smaller than the sum of its proper divisors (1319115834).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1123131402 is a wasteful number, since it uses less digits than its factorization.

1123131402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225542 (or 225539 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1123131402 is about 33513.1526717496. The cubic root of 1123131402 is about 1039.4657642011.

Adding to 1123131402 its reverse (2041313211), we get a palindrome (3164444613).

The spelling of 1123131402 in words is "one billion, one hundred twenty-three million, one hundred thirty-one thousand, four hundred two".