53505143 has 4 divisors (see below), whose sum is σ = 54514728. Its totient is φ = 52495560.

The previous prime is 53505139. The next prime is 53505167. The reversal of 53505143 is 34150535.

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 53505143 - 2² = 53505139 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53505173) 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, 504713 + ... + 504818.

It is an arithmetic number, because the mean of its divisors is an integer number (13628682).

Almost surely, 2^53505143 is an apocalyptic number.

53505143 is a gapful number since it is divisible by the number (53) formed by its first and last digit.

53505143 is a deficient number, since it is larger than the sum of its proper divisors (1009585).

53505143 is a wasteful number, since it uses less digits than its factorization.

53505143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009584.

The product of its (nonzero) digits is 4500, while the sum is 26.

The square root of 53505143 is about 7314.7209789574. The cubic root of 53505143 is about 376.8181760119.

Adding to 53505143 its reverse (34150535), we get a palindrome (87655678).

The spelling of 53505143 in words is "fifty-three million, five hundred five thousand, one hundred forty-three".