53156521 has 4 divisors (see below), whose sum is σ = 57988944. Its totient is φ = 48324100.

The previous prime is 53156513. The next prime is 53156561. The reversal of 53156521 is 12565135.

53156521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 53156521 - 2³ = 53156513 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 53156521.

It is not an unprimeable number, because it can be changed into a prime (53156561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2416195 + ... + 2416216.

It is an arithmetic number, because the mean of its divisors is an integer number (14497236).

Almost surely, 2^53156521 is an apocalyptic number.

It is an amenable number.

53156521 is a deficient number, since it is larger than the sum of its proper divisors (4832423).

53156521 is a wasteful number, since it uses less digits than its factorization.

53156521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4832422.

The product of its digits is 4500, while the sum is 28.

The square root of 53156521 is about 7290.8518706664. The cubic root of 53156521 is about 375.9979840883.

The spelling of 53156521 in words is "fifty-three million, one hundred fifty-six thousand, five hundred twenty-one".