1231320263 has 2 divisors, whose sum is σ = 1231320264. Its totient is φ = 1231320262.

The previous prime is 1231320239. The next prime is 1231320281. The reversal of 1231320263 is 3620231321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1231320263 - 2⁶ = 1231320199 is a prime.

It is a super-2 number, since 2×1231320263² = 3032299180148778338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231320163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615660131 + 615660132.

It is an arithmetic number, because the mean of its divisors is an integer number (615660132).

Almost surely, 2^1231320263 is an apocalyptic number.

1231320263 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231320263 is an equidigital number, since it uses as much as digits as its factorization.

1231320263 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 1231320263 is about 35090.1733110568. The cubic root of 1231320263 is about 1071.8244887790.

Adding to 1231320263 its reverse (3620231321), we get a palindrome (4851551584).

The spelling of 1231320263 in words is "one billion, two hundred thirty-one million, three hundred twenty thousand, two hundred sixty-three".