1243011131223 has 4 divisors (see below), whose sum is σ = 1657348174968. Its totient is φ = 828674087480.

The previous prime is 1243011131207. The next prime is 1243011131231. The reversal of 1243011131223 is 3221311103421.

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 1243011131223 - 2⁴ = 1243011131207 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1243011131193 and 1243011131202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243011131233) 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, 207168521868 + ... + 207168521873.

It is an arithmetic number, because the mean of its divisors is an integer number (414337043742).

Almost surely, 2^{1243011131223} is an apocalyptic number.

1243011131223 is a deficient number, since it is larger than the sum of its proper divisors (414337043745).

1243011131223 is an equidigital number, since it uses as much as digits as its factorization.

1243011131223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414337043744.

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 1243011131223 its reverse (3221311103421), we get a palindrome (4464322234644).

The spelling of 1243011131223 in words is "one trillion, two hundred forty-three billion, eleven million, one hundred thirty-one thousand, two hundred twenty-three".