231400843 has 4 divisors (see below), whose sum is σ = 237044808. Its totient is φ = 225756880.

The previous prime is 231400837. The next prime is 231400859. The reversal of 231400843 is 348004132.

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

It is a cyclic number.

It is not a de Polignac number, because 231400843 - 2¹⁷ = 231269771 is a prime.

It is a super-2 number, since 2×231400843² = 107092700282221298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231400643) 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, 2821921 + ... + 2822002.

It is an arithmetic number, because the mean of its divisors is an integer number (59261202).

Almost surely, 2^231400843 is an apocalyptic number.

231400843 is a deficient number, since it is larger than the sum of its proper divisors (5643965).

231400843 is an equidigital number, since it uses as much as digits as its factorization.

231400843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5643964.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 231400843 is about 15211.8652045040. The cubic root of 231400843 is about 613.9339435633.

Adding to 231400843 its reverse (348004132), we get a palindrome (579404975).

The spelling of 231400843 in words is "two hundred thirty-one million, four hundred thousand, eight hundred forty-three".