231000531 has 4 divisors (see below), whose sum is σ = 308000712. Its totient is φ = 154000352.

The previous prime is 231000521. The next prime is 231000533. The reversal of 231000531 is 135000132.

It is a happy number.

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 231000531 - 2⁶ = 231000467 is a prime.

It is a super-2 number, since 2×231000531² = 106722490644563922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 231000531.

It is not an unprimeable number, because it can be changed into a prime (231000533) 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, 38500086 + ... + 38500091.

It is an arithmetic number, because the mean of its divisors is an integer number (77000178).

Almost surely, 2^231000531 is an apocalyptic number.

231000531 is a deficient number, since it is larger than the sum of its proper divisors (77000181).

231000531 is an equidigital number, since it uses as much as digits as its factorization.

231000531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77000180.

The product of its (nonzero) digits is 90, while the sum is 15.

The square root of 231000531 is about 15198.7016221781. The cubic root of 231000531 is about 613.5797141110.

Adding to 231000531 its reverse (135000132), we get a palindrome (366000663).

The spelling of 231000531 in words is "two hundred thirty-one million, five hundred thirty-one", and thus it is an aban number.