1223143231 has 4 divisors (see below), whose sum is σ = 1235018512. Its totient is φ = 1211267952.

The previous prime is 1223143193. The next prime is 1223143247. The reversal of 1223143231 is 1323413221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1223143231 is a prime.

It is a super-2 number, since 2×1223143231² = 2992158727082238722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223143291) 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, 5937486 + ... + 5937691.

It is an arithmetic number, because the mean of its divisors is an integer number (308754628).

Almost surely, 2^1223143231 is an apocalyptic number.

1223143231 is a deficient number, since it is larger than the sum of its proper divisors (11875281).

1223143231 is a wasteful number, since it uses less digits than its factorization.

1223143231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11875280.

The product of its digits is 864, while the sum is 22.

The square root of 1223143231 is about 34973.4646696606. The cubic root of 1223143231 is about 1069.4466032298.

Adding to 1223143231 its reverse (1323413221), we get a palindrome (2546556452).

The spelling of 1223143231 in words is "one billion, two hundred twenty-three million, one hundred forty-three thousand, two hundred thirty-one".