1123513121 has 4 divisors (see below), whose sum is σ = 1126049712. Its totient is φ = 1120976532.

The previous prime is 1123513109. The next prime is 1123513123. The reversal of 1123513121 is 1213153211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1213153211 = 19 ⋅63850169.

It is a cyclic number.

It is not a de Polignac number, because 1123513121 - 2⁶ = 1123513057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1123513093 and 1123513102.

It is not an unprimeable number, because it can be changed into a prime (1123513123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1267631 + ... + 1268516.

It is an arithmetic number, because the mean of its divisors is an integer number (281512428).

Almost surely, 2^1123513121 is an apocalyptic number.

It is an amenable number.

1123513121 is a deficient number, since it is larger than the sum of its proper divisors (2536591).

1123513121 is an equidigital number, since it uses as much as digits as its factorization.

1123513121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2536590.

The product of its digits is 180, while the sum is 20.

The square root of 1123513121 is about 33518.8472504649. The cubic root of 1123513121 is about 1039.5835120408.

Adding to 1123513121 its reverse (1213153211), we get a palindrome (2336666332).

The spelling of 1123513121 in words is "one billion, one hundred twenty-three million, five hundred thirteen thousand, one hundred twenty-one".