123542543 has 2 divisors, whose sum is σ = 123542544. Its totient is φ = 123542542.

The previous prime is 123542501. The next prime is 123542557. The reversal of 123542543 is 345245321.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 123542543 - 2¹² = 123538447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123532543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61771271 + 61771272.

It is an arithmetic number, because the mean of its divisors is an integer number (61771272).

Almost surely, 2^123542543 is an apocalyptic number.

123542543 is a deficient number, since it is larger than the sum of its proper divisors (1).

123542543 is an equidigital number, since it uses as much as digits as its factorization.

123542543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14400, while the sum is 29.

The square root of 123542543 is about 11114.9693206954. The cubic root of 123542543 is about 498.0491220503.

Adding to 123542543 its reverse (345245321), we get a palindrome (468787864).

The spelling of 123542543 in words is "one hundred twenty-three million, five hundred forty-two thousand, five hundred forty-three".