16555243 has 4 divisors (see below), whose sum is σ = 17002720. Its totient is φ = 16107768.

The previous prime is 16555219. The next prime is 16555249. The reversal of 16555243 is 34255561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34255561 = 17 ⋅2015033.

It is a cyclic number.

It is not a de Polignac number, because 16555243 - 2⁹ = 16554731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16555249) 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, 223683 + ... + 223756.

It is an arithmetic number, because the mean of its divisors is an integer number (4250680).

Almost surely, 2^16555243 is an apocalyptic number.

16555243 is a deficient number, since it is larger than the sum of its proper divisors (447477).

16555243 is an equidigital number, since it uses as much as digits as its factorization.

16555243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447476.

The product of its digits is 18000, while the sum is 31.

The square root of 16555243 is about 4068.8134634067. The cubic root of 16555243 is about 254.8659708322.

It can be divided in two parts, 16 and 555243, that multiplied together give a palindrome (8883888).

The spelling of 16555243 in words is "sixteen million, five hundred fifty-five thousand, two hundred forty-three".