231220440243 has 64 divisors (see below), whose sum is σ = 374201210880. Its totient is φ = 140246878464.

The previous prime is 231220440233. The next prime is 231220440247. The reversal of 231220440243 is 342044022132.

231220440243 is a `hidden beast` number, since 2 + 3 + 12 + 204 + 402 + 43 = 666.

It is not a de Polignac number, because 231220440243 - 2¹⁴ = 231220423859 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (231220440247) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 74996980 + ... + 75000062.

It is an arithmetic number, because the mean of its divisors is an integer number (5846893920).

Almost surely, 2^231220440243 is an apocalyptic number.

231220440243 is a deficient number, since it is larger than the sum of its proper divisors (142980770637).

231220440243 is a wasteful number, since it uses less digits than its factorization.

231220440243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6105 (or 6099 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 231220440243 its reverse (342044022132), we get a palindrome (573264462375).

The spelling of 231220440243 in words is "two hundred thirty-one billion, two hundred twenty million, four hundred forty thousand, two hundred forty-three".