823231 has 2 divisors, whose sum is σ = 823232. Its totient is φ = 823230.

The previous prime is 823219. The next prime is 823237. The reversal of 823231 is 132328.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 823231 - 2¹⁹ = 298943 is a prime.

It is a super-2 number, since 2×823231² = 1355418558722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 823199 and 823208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (823237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411615 + 411616.

It is an arithmetic number, because the mean of its divisors is an integer number (411616).

2⁸²³²³¹ is an apocalyptic number.

823231 is a deficient number, since it is larger than the sum of its proper divisors (1).

823231 is an equidigital number, since it uses as much as digits as its factorization.

823231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 19.

The square root of 823231 is about 907.3207812014. The cubic root of 823231 is about 93.7217894379.

Adding to 823231 its reverse (132328), we get a palindrome (955559).

The spelling of 823231 in words is "eight hundred twenty-three thousand, two hundred thirty-one".