1231663 has 2 divisors, whose sum is σ = 1231664. Its totient is φ = 1231662.

The previous prime is 1231631. The next prime is 1231669. The reversal of 1231663 is 3661321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1231663 - 2⁵ = 1231631 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615831 + 615832.

It is an arithmetic number, because the mean of its divisors is an integer number (615832).

2^1231663 is an apocalyptic number.

1231663 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231663 is an equidigital number, since it uses as much as digits as its factorization.

1231663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 22.

The square root of 1231663 is about 1109.8031356957. The cubic root of 1231663 is about 107.1923926714.

Adding to 1231663 its reverse (3661321), we get a palindrome (4892984).

The spelling of 1231663 in words is "one million, two hundred thirty-one thousand, six hundred sixty-three".