1123209031 has 4 divisors (see below), whose sum is σ = 1283667472. Its totient is φ = 962750592.

The previous prime is 1123209029. The next prime is 1123209041. The reversal of 1123209031 is 1309023211.

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 1123209031 - 2¹ = 1123209029 is a prime.

It is a super-2 number, since 2×1123209031² = 2523197054639917922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1123208993 and 1123209011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123209001) 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, 80229210 + ... + 80229223.

It is an arithmetic number, because the mean of its divisors is an integer number (320916868).

Almost surely, 2^1123209031 is an apocalyptic number.

1123209031 is a deficient number, since it is larger than the sum of its proper divisors (160458441).

1123209031 is an equidigital number, since it uses as much as digits as its factorization.

1123209031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160458440.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 1123209031 is about 33514.3108388044. The cubic root of 1123209031 is about 1039.4897123722.

The spelling of 1123209031 in words is "one billion, one hundred twenty-three million, two hundred nine thousand, thirty-one".