1231143647 has 2 divisors, whose sum is σ = 1231143648. Its totient is φ = 1231143646.

The previous prime is 1231143631. The next prime is 1231143649. The reversal of 1231143647 is 7463411321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1231143647 - 2⁴ = 1231143631 is a prime.

Together with 1231143649, 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 (1231143649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615571823 + 615571824.

It is an arithmetic number, because the mean of its divisors is an integer number (615571824).

Almost surely, 2^1231143647 is an apocalyptic number.

1231143647 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231143647 is an equidigital number, since it uses as much as digits as its factorization.

1231143647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 32.

The square root of 1231143647 is about 35087.6566188168. The cubic root of 1231143647 is about 1071.7732401556.

Adding to 1231143647 its reverse (7463411321), we get a palindrome (8694554968).

The spelling of 1231143647 in words is "one billion, two hundred thirty-one million, one hundred forty-three thousand, six hundred forty-seven".