1243232231 has 4 divisors (see below), whose sum is σ = 1247720712. Its totient is φ = 1238743752.

The previous prime is 1243232213. The next prime is 1243232261. The reversal of 1243232231 is 1322323421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1322323421 = 389 ⋅3399289.

It is a cyclic number.

It is not a de Polignac number, because 1243232231 - 2³⁰ = 169490407 is a prime.

It is a super-2 number, since 2×1243232231² = 3091252760394474722, 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 = 1243232197 and 1243232206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243232201) 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, 2243825 + ... + 2244378.

It is an arithmetic number, because the mean of its divisors is an integer number (311930178).

Almost surely, 2^1243232231 is an apocalyptic number.

1243232231 is a deficient number, since it is larger than the sum of its proper divisors (4488481).

1243232231 is an equidigital number, since it uses as much as digits as its factorization.

1243232231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4488480.

The product of its digits is 1728, while the sum is 23.

The square root of 1243232231 is about 35259.4984507721. The cubic root of 1243232231 is about 1075.2697303327.

Adding to 1243232231 its reverse (1322323421), we get a palindrome (2565555652).

The spelling of 1243232231 in words is "one billion, two hundred forty-three million, two hundred thirty-two thousand, two hundred thirty-one".