53565511 has 4 divisors (see below), whose sum is σ = 53657352. Its totient is φ = 53473672.

The previous prime is 53565481. The next prime is 53565527. The reversal of 53565511 is 11556535.

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 53565511 - 2¹⁹ = 53041223 is a prime.

It is a super-2 number, since 2×53565511² = 5738527937382242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53560511) 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, 45040 + ... + 46213.

It is an arithmetic number, because the mean of its divisors is an integer number (13414338).

Almost surely, 2^53565511 is an apocalyptic number.

53565511 is a deficient number, since it is larger than the sum of its proper divisors (91841).

53565511 is an equidigital number, since it uses as much as digits as its factorization.

53565511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91840.

The product of its digits is 11250, while the sum is 31.

The square root of 53565511 is about 7318.8462888627. The cubic root of 53565511 is about 376.9598397135.

The spelling of 53565511 in words is "fifty-three million, five hundred sixty-five thousand, five hundred eleven".