231227531 has 2 divisors, whose sum is σ = 231227532. Its totient is φ = 231227530.

The previous prime is 231227501. The next prime is 231227551. The reversal of 231227531 is 135722132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231227531 - 2¹⁰ = 231226507 is a prime.

It is a super-2 number, since 2×231227531² = 106932342184711922, which contains 22 as substring.

It is equal to p_12706406 and since 231227531 and 12706406 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231227531.

It is not a weakly prime, because it can be changed into another prime (231227501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115613765 + 115613766.

It is an arithmetic number, because the mean of its divisors is an integer number (115613766).

Almost surely, 2^231227531 is an apocalyptic number.

231227531 is a deficient number, since it is larger than the sum of its proper divisors (1).

231227531 is an equidigital number, since it uses as much as digits as its factorization.

231227531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 26.

The square root of 231227531 is about 15206.1675316301. The cubic root of 231227531 is about 613.7806328360.

Adding to 231227531 its reverse (135722132), we get a palindrome (366949663).

The spelling of 231227531 in words is "two hundred thirty-one million, two hundred twenty-seven thousand, five hundred thirty-one".