1231205323 has 2 divisors, whose sum is σ = 1231205324. Its totient is φ = 1231205322.

The previous prime is 1231205321. The next prime is 1231205351. The reversal of 1231205323 is 3235021321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231205323 - 2¹ = 1231205321 is a prime.

Together with 1231205321, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1231205294 and 1231205303.

It is not a weakly prime, because it can be changed into another prime (1231205321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615602661 + 615602662.

It is an arithmetic number, because the mean of its divisors is an integer number (615602662).

Almost surely, 2^1231205323 is an apocalyptic number.

1231205323 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231205323 is an equidigital number, since it uses as much as digits as its factorization.

1231205323 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 1231205323 is about 35088.5354923798. The cubic root of 1231205323 is about 1071.7911372230.

Adding to 1231205323 its reverse (3235021321), we get a palindrome (4466226644).

The spelling of 1231205323 in words is "one billion, two hundred thirty-one million, two hundred five thousand, three hundred twenty-three".