155543 has 4 divisors (see below), whose sum is σ = 157080. Its totient is φ = 154008.

The previous prime is 155539. The next prime is 155557. The reversal of 155543 is 345551.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 155543 - 2² = 155539 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155593) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 605 + ... + 822.

It is an arithmetic number, because the mean of its divisors is an integer number (39270).

2¹⁵⁵⁵⁴³ is an apocalyptic number.

155543 is a deficient number, since it is larger than the sum of its proper divisors (1537).

155543 is a wasteful number, since it uses less digits than its factorization.

155543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536.

The product of its digits is 1500, while the sum is 23.

The square root of 155543 is about 394.3894014803. The cubic root of 155543 is about 53.7795078648.

The spelling of 155543 in words is "one hundred fifty-five thousand, five hundred forty-three".