123555543 has 16 divisors (see below), whose sum is σ = 171244416. Its totient is φ = 79172640.

The previous prime is 123555529. The next prime is 123555557. The reversal of 123555543 is 345555321.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (123555529) and next prime (123555557).

It is not a de Polignac number, because 123555543 - 2¹² = 123551447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123555583) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2508 + ... + 15918.

It is an arithmetic number, because the mean of its divisors is an integer number (10702776).

Almost surely, 2^123555543 is an apocalyptic number.

123555543 is a deficient number, since it is larger than the sum of its proper divisors (47688873).

123555543 is a wasteful number, since it uses less digits than its factorization.

123555543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13534.

The product of its digits is 45000, while the sum is 33.

The square root of 123555543 is about 11115.5541022479. The cubic root of 123555543 is about 498.0665908276.

The spelling of 123555543 in words is "one hundred twenty-three million, five hundred fifty-five thousand, five hundred forty-three".