53143565 has 4 divisors (see below), whose sum is σ = 63772284. Its totient is φ = 42514848.

The previous prime is 53143553. The next prime is 53143567. The reversal of 53143565 is 56534135.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37039396 + 16104169 = 6086^2 + 4013^2 .

It is a cyclic number.

It is not a de Polignac number, because 53143565 - 2²⁰ = 52094989 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 (53143567) 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, 5314352 + ... + 5314361.

It is an arithmetic number, because the mean of its divisors is an integer number (15943071).

Almost surely, 2^53143565 is an apocalyptic number.

It is an amenable number.

53143565 is a deficient number, since it is larger than the sum of its proper divisors (10628719).

53143565 is a wasteful number, since it uses less digits than its factorization.

53143565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10628718.

The product of its digits is 27000, while the sum is 32.

The square root of 53143565 is about 7289.9633058061. The cubic root of 53143565 is about 375.9674338967.

The spelling of 53143565 in words is "fifty-three million, one hundred forty-three thousand, five hundred sixty-five".