231400243 has 16 divisors (see below), whose sum is σ = 253946880. Its totient is φ = 209978496.

The previous prime is 231400241. The next prime is 231400249. The reversal of 231400243 is 342004132.

It is a cyclic number.

It is not a de Polignac number, because 231400243 - 2¹ = 231400241 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231400243.

It is not an unprimeable number, because it can be changed into a prime (231400241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55746 + ... + 59752.

It is an arithmetic number, because the mean of its divisors is an integer number (15871680).

Almost surely, 2^231400243 is an apocalyptic number.

231400243 is a deficient number, since it is larger than the sum of its proper divisors (22546637).

231400243 is a wasteful number, since it uses less digits than its factorization.

231400243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4146.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 231400243 is about 15211.8454830438. The cubic root of 231400243 is about 613.9334129391.

Adding to 231400243 its reverse (342004132), we get a palindrome (573404375).

The spelling of 231400243 in words is "two hundred thirty-one million, four hundred thousand, two hundred forty-three".