231223947 has 16 divisors (see below), whose sum is σ = 320765952. Its totient is φ = 147994560.

The previous prime is 231223933. The next prime is 231223957. The reversal of 231223947 is 749322132.

It is not a de Polignac number, because 231223947 - 2¹⁰ = 231222923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231223957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2023 + ... + 21599.

It is an arithmetic number, because the mean of its divisors is an integer number (20047872).

Almost surely, 2^231223947 is an apocalyptic number.

231223947 is a deficient number, since it is larger than the sum of its proper divisors (89542005).

231223947 is a wasteful number, since it uses less digits than its factorization.

231223947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19738.

The product of its digits is 18144, while the sum is 33.

The square root of 231223947 is about 15206.0496842540. The cubic root of 231223947 is about 613.7774616433. Note that the first 3 decimals are identical.

The spelling of 231223947 in words is "two hundred thirty-one million, two hundred twenty-three thousand, nine hundred forty-seven".