28171543 has 2 divisors, whose sum is σ = 28171544. Its totient is φ = 28171542.

The previous prime is 28171537. The next prime is 28171553. The reversal of 28171543 is 34517182.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28171543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28171513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14085771 + 14085772.

It is an arithmetic number, because the mean of its divisors is an integer number (14085772).

Almost surely, 2^28171543 is an apocalyptic number.

28171543 is a deficient number, since it is larger than the sum of its proper divisors (1).

28171543 is an equidigital number, since it uses as much as digits as its factorization.

28171543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 31.

The square root of 28171543 is about 5307.6871610900. The cubic root of 28171543 is about 304.2777607659.

It can be divided in two parts, 281 and 71543, that added together give a square (71824 = 268²).

The spelling of 28171543 in words is "twenty-eight million, one hundred seventy-one thousand, five hundred forty-three".