43551 has 8 divisors (see below), whose sum is σ = 64560. Its totient is φ = 29016.

The previous prime is 43543. The next prime is 43573. The reversal of 43551 is 15534.

43551 is nontrivially palindromic in base 11.

It is not a de Polignac number, because 43551 - 2³ = 43543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 780 + ... + 833.

It is an arithmetic number, because the mean of its divisors is an integer number (8070).

2⁴³⁵⁵¹ is an apocalyptic number.

43551 is a deficient number, since it is larger than the sum of its proper divisors (21009).

43551 is a wasteful number, since it uses less digits than its factorization.

43551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1622 (or 1616 counting only the distinct ones).

The product of its digits is 300, while the sum is 18.

The square root of 43551 is about 208.6887634733. The cubic root of 43551 is about 35.1829872161.

It can be divided in two parts, 4355 and 1, that added together give a square (4356 = 66²).

The spelling of 43551 in words is "forty-three thousand, five hundred fifty-one".