1231123313647 has 2 divisors, whose sum is σ = 1231123313648. Its totient is φ = 1231123313646.

The previous prime is 1231123313621. The next prime is 1231123313681. The reversal of 1231123313647 is 7463133211321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231123313647 - 2¹⁹ = 1231122789359 is a prime.

It is a super-2 number, since 2×1231123313647² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1231123313687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615561656823 + 615561656824.

It is an arithmetic number, because the mean of its divisors is an integer number (615561656824).

Almost surely, 2^{1231123313647} is an apocalyptic number.

1231123313647 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231123313647 is an equidigital number, since it uses as much as digits as its factorization.

1231123313647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 37.

Adding to 1231123313647 its reverse (7463133211321), we get a palindrome (8694256524968).

The spelling of 1231123313647 in words is "one trillion, two hundred thirty-one billion, one hundred twenty-three million, three hundred thirteen thousand, six hundred forty-seven".