231121543 has 4 divisors (see below), whose sum is σ = 234376848. Its totient is φ = 227866240.

The previous prime is 231121459. The next prime is 231121571. The reversal of 231121543 is 345121132.

It is a happy number.

231121543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 231121543 - 2⁹ = 231121031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231127543) 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, 1627546 + ... + 1627687.

It is an arithmetic number, because the mean of its divisors is an integer number (58594212).

Almost surely, 2^231121543 is an apocalyptic number.

231121543 is a deficient number, since it is larger than the sum of its proper divisors (3255305).

231121543 is an equidigital number, since it uses as much as digits as its factorization.

231121543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3255304.

The product of its digits is 720, while the sum is 22.

The square root of 231121543 is about 15202.6820988929. The cubic root of 231121543 is about 613.6868387515.

Adding to 231121543 its reverse (345121132), we get a palindrome (576242675).

The spelling of 231121543 in words is "two hundred thirty-one million, one hundred twenty-one thousand, five hundred forty-three".