231223131 has 6 divisors (see below), whose sum is σ = 333988980. Its totient is φ = 154148748.

The previous prime is 231223121. The next prime is 231223133. The reversal of 231223131 is 131322132.

It is not a de Polignac number, because 231223131 - 2⁹ = 231222619 is a prime.

It is a super-2 number, since 2×231223131² = 106928272618886322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231223133) 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, 12845721 + ... + 12845738.

It is an arithmetic number, because the mean of its divisors is an integer number (55664830).

Almost surely, 2^231223131 is an apocalyptic number.

231223131 is a deficient number, since it is larger than the sum of its proper divisors (102765849).

231223131 is a wasteful number, since it uses less digits than its factorization.

231223131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25691465 (or 25691462 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 231223131 is about 15206.0228528041. The cubic root of 231223131 is about 613.7767396261.

Adding to 231223131 its reverse (131322132), we get a palindrome (362545263).

Subtracting from 231223131 its reverse (131322132), we obtain a palindrome (99900999).

The spelling of 231223131 in words is "two hundred thirty-one million, two hundred twenty-three thousand, one hundred thirty-one".