1231542210643 has 2 divisors, whose sum is σ = 1231542210644. Its totient is φ = 1231542210642.

The previous prime is 1231542210641. The next prime is 1231542210659. The reversal of 1231542210643 is 3460122451321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231542210643 - 2¹ = 1231542210641 is a prime.

Together with 1231542210641, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1231542210599 and 1231542210608.

It is not a weakly prime, because it can be changed into another prime (1231542210641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615771105321 + 615771105322.

It is an arithmetic number, because the mean of its divisors is an integer number (615771105322).

Almost surely, 2^{1231542210643} is an apocalyptic number.

1231542210643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231542210643 is an equidigital number, since it uses as much as digits as its factorization.

1231542210643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 34.

Adding to 1231542210643 its reverse (3460122451321), we get a palindrome (4691664661964).

The spelling of 1231542210643 in words is "one trillion, two hundred thirty-one billion, five hundred forty-two million, two hundred ten thousand, six hundred forty-three".