1123243513 has 6 divisors (see below), whose sum is σ = 1306630266. Its totient is φ = 962780112.

The previous prime is 1123243487. The next prime is 1123243547. The reversal of 1123243513 is 3153423211.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 659616489 + 463627024 = 25683^2 + 21532^2 .

It is not a de Polignac number, because 1123243513 - 2⁹ = 1123243001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1123243013) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11461620 + ... + 11461717.

It is an arithmetic number, because the mean of its divisors is an integer number (217771711).

Almost surely, 2^1123243513 is an apocalyptic number.

It is an amenable number.

1123243513 is a deficient number, since it is larger than the sum of its proper divisors (183386753).

1123243513 is an equidigital number, since it uses as much as digits as its factorization.

1123243513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22923351 (or 22923344 counting only the distinct ones).

The product of its digits is 2160, while the sum is 25.

The square root of 1123243513 is about 33514.8252718107. The cubic root of 1123243513 is about 1039.5003495485.

Adding to 1123243513 its reverse (3153423211), we get a palindrome (4276666724).

It can be divided in two parts, 11232 and 43513, that added together give a palindrome (54745).

The spelling of 1123243513 in words is "one billion, one hundred twenty-three million, two hundred forty-three thousand, five hundred thirteen".