1123031213 has 4 divisors (see below), whose sum is σ = 1124181660. Its totient is φ = 1121880768.

The previous prime is 1123031209. The next prime is 1123031323. The reversal of 1123031213 is 3121303211.

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 541353289 + 581677924 = 23267^2 + 24118^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123031213 - 2² = 1123031209 is a prime.

It is a super-2 number, since 2×1123031213² = 2522398210744502738, 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 = 1123031191 and 1123031200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123031813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 573758 + ... + 575711.

It is an arithmetic number, because the mean of its divisors is an integer number (281045415).

Almost surely, 2^1123031213 is an apocalyptic number.

It is an amenable number.

1123031213 is a deficient number, since it is larger than the sum of its proper divisors (1150447).

1123031213 is an equidigital number, since it uses as much as digits as its factorization.

1123031213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1150446.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1123031213 is about 33511.6578670766. The cubic root of 1123031213 is about 1039.4348547480.

Adding to 1123031213 its reverse (3121303211), we get a palindrome (4244334424).

The spelling of 1123031213 in words is "one billion, one hundred twenty-three million, thirty-one thousand, two hundred thirteen".