231040531 has 2 divisors, whose sum is σ = 231040532. Its totient is φ = 231040530.

The previous prime is 231040507. The next prime is 231040571. The reversal of 231040531 is 135040132.

231040531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 231040531 - 2¹³ = 231032339 is a prime.

It is a super-2 number, since 2×231040531² = 106759453929523922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 231040499 and 231040508.

It is not a weakly prime, because it can be changed into another prime (231040501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115520265 + 115520266.

It is an arithmetic number, because the mean of its divisors is an integer number (115520266).

Almost surely, 2^231040531 is an apocalyptic number.

231040531 is a deficient number, since it is larger than the sum of its proper divisors (1).

231040531 is an equidigital number, since it uses as much as digits as its factorization.

231040531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 231040531 is about 15200.0174670952. The cubic root of 231040531 is about 613.6151278421.

Adding to 231040531 its reverse (135040132), we get a palindrome (366080663).

The spelling of 231040531 in words is "two hundred thirty-one million, forty thousand, five hundred thirty-one".