123435949543 has 2 divisors, whose sum is σ = 123435949544. Its totient is φ = 123435949542.

The previous prime is 123435949529. The next prime is 123435949573. The reversal of 123435949543 is 345949534321.

It is a weak prime.

It is an emirp because it is prime and its reverse (345949534321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123435949543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123435949573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61717974771 + 61717974772.

It is an arithmetic number, because the mean of its divisors is an integer number (61717974772).

Almost surely, 2^123435949543 is an apocalyptic number.

123435949543 is a deficient number, since it is larger than the sum of its proper divisors (1).

123435949543 is an equidigital number, since it uses as much as digits as its factorization.

123435949543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6998400, while the sum is 52.

The spelling of 123435949543 in words is "one hundred twenty-three billion, four hundred thirty-five million, nine hundred forty-nine thousand, five hundred forty-three".