53409543 has 8 divisors (see below), whose sum is σ = 77686656. Its totient is φ = 32369400.

The previous prime is 53409541. The next prime is 53409547. The reversal of 53409543 is 34590435.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 53409543 - 2¹ = 53409541 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 1618471 = 53409543 / (5 + 3 + 4 + 0 + 9 + 5 + 4 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53409541) 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, 809203 + ... + 809268.

It is an arithmetic number, because the mean of its divisors is an integer number (9710832).

Almost surely, 2^53409543 is an apocalyptic number.

53409543 is a deficient number, since it is larger than the sum of its proper divisors (24277113).

53409543 is a wasteful number, since it uses less digits than its factorization.

53409543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1618485.

The product of its (nonzero) digits is 32400, while the sum is 33.

The square root of 53409543 is about 7308.1832899839. The cubic root of 53409543 is about 376.5936163276.

Adding to 53409543 its reverse (34590435), we get a palindrome (87999978).

The spelling of 53409543 in words is "fifty-three million, four hundred nine thousand, five hundred forty-three".