53865521 has 4 divisors (see below), whose sum is σ = 54669552. Its totient is φ = 53061492.

The previous prime is 53865509. The next prime is 53865527. The reversal of 53865521 is 12556835.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 53865521 - 2⁶ = 53865457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53865527) 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, 401915 + ... + 402048.

It is an arithmetic number, because the mean of its divisors is an integer number (13667388).

Almost surely, 2^53865521 is an apocalyptic number.

It is an amenable number.

53865521 is a deficient number, since it is larger than the sum of its proper divisors (804031).

53865521 is an equidigital number, since it uses as much as digits as its factorization.

53865521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804030.

The product of its digits is 36000, while the sum is 35.

The square root of 53865521 is about 7339.3133875043. The cubic root of 53865521 is about 377.6622894741.

The spelling of 53865521 in words is "fifty-three million, eight hundred sixty-five thousand, five hundred twenty-one".