53145521 has 16 divisors (see below), whose sum is σ = 62935488. Its totient is φ = 44241600.

The previous prime is 53145517. The next prime is 53145577. The reversal of 53145521 is 12554135.

It is not a de Polignac number, because 53145521 - 2² = 53145517 is a prime.

It is a super-2 number, since 2×53145521² = 5648892804722882, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (53145581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17315 + ... + 20151.

It is an arithmetic number, because the mean of its divisors is an integer number (3933468).

Almost surely, 2^53145521 is an apocalyptic number.

It is an amenable number.

53145521 is a deficient number, since it is larger than the sum of its proper divisors (9789967).

53145521 is a wasteful number, since it uses less digits than its factorization.

53145521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2992.

The product of its digits is 3000, while the sum is 26.

The square root of 53145521 is about 7290.0974616256. The cubic root of 53145521 is about 375.9720464544.

Adding to 53145521 its reverse (12554135), we get a palindrome (65699656).

The spelling of 53145521 in words is "fifty-three million, one hundred forty-five thousand, five hundred twenty-one".