1123404031 has 4 divisors (see below), whose sum is σ = 1133710600. Its totient is φ = 1113097464.

The previous prime is 1123403971. The next prime is 1123404041. The reversal of 1123404031 is 1304043211.

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

It is a cyclic number.

It is not a de Polignac number, because 1123404031 - 2¹⁷ = 1123272959 is a prime.

It is a super-3 number, since 3×1123404031³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123404041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5153121 + ... + 5153338.

It is an arithmetic number, because the mean of its divisors is an integer number (283427650).

Almost surely, 2^1123404031 is an apocalyptic number.

1123404031 is a deficient number, since it is larger than the sum of its proper divisors (10306569).

1123404031 is a wasteful number, since it uses less digits than its factorization.

1123404031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10306568.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1123404031 is about 33517.2199175290. The cubic root of 1123404031 is about 1039.5498640623.

Adding to 1123404031 its reverse (1304043211), we get a palindrome (2427447242).

The spelling of 1123404031 in words is "one billion, one hundred twenty-three million, four hundred four thousand, thirty-one".