1231231 has 2 divisors, whose sum is σ = 1231232.
Its totient is φ = 1231230.
The previous prime is 1231229. The next prime is 1231247. The reversal of 1231231 is 1321321.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 1231231 - 21 = 1231229 is a prime.
It is a super-2 number, since 2×12312312 = 3031859550722, which contains 22 as substring.
Together with 1231229, it forms a pair of twin primes.
It is a Chen prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (1231201) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615615 + 615616.
It is an arithmetic number, because the mean of its divisors is an integer number (615616).
21231231 is an apocalyptic number.
1231231 is a deficient number, since it is larger than the sum of its proper divisors (1).
1231231 is an equidigital number, since it uses as much as digits as its factorization.
1231231 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 36, while the sum is 13.
The square root of 1231231 is about 1109.6084895133.
The cubic root of 1231231 is about 107.1798587968.
Adding to 1231231 its reverse (1321321), we get a palindrome (2552552).
The spelling of 1231231 in words is "one million, two hundred thirty-one thousand, two hundred thirty-one".