53309543 has 4 divisors (see below), whose sum is σ = 60925200. Its totient is φ = 45693888.

The previous prime is 53309539. The next prime is 53309549. The reversal of 53309543 is 34590335.

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 53309543 - 2² = 53309539 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53309549) 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, 3807818 + ... + 3807831.

It is an arithmetic number, because the mean of its divisors is an integer number (15231300).

Almost surely, 2^53309543 is an apocalyptic number.

53309543 is a deficient number, since it is larger than the sum of its proper divisors (7615657).

53309543 is an equidigital number, since it uses as much as digits as its factorization.

53309543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7615656.

The product of its (nonzero) digits is 24300, while the sum is 32.

The square root of 53309543 is about 7301.3384389439. The cubic root of 53309543 is about 376.3584343263.

Adding to 53309543 its reverse (34590335), we get a palindrome (87899878).

The spelling of 53309543 in words is "fifty-three million, three hundred nine thousand, five hundred forty-three".