53345521 has 4 divisors (see below), whose sum is σ = 56153200. Its totient is φ = 50537844.

The previous prime is 53345497. The next prime is 53345531. The reversal of 53345521 is 12554335.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12554335 = 5 ⋅2510867.

It is a cyclic number.

It is not a de Polignac number, because 53345521 - 2²¹ = 51248369 is a prime.

It is a super-2 number, since 2×53345521² = 5691489221522882, which contains 22 as substring.

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 53345521.

It is not an unprimeable number, because it can be changed into a prime (53345531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1403811 + ... + 1403848.

It is an arithmetic number, because the mean of its divisors is an integer number (14038300).

Almost surely, 2^53345521 is an apocalyptic number.

It is an amenable number.

53345521 is a deficient number, since it is larger than the sum of its proper divisors (2807679).

53345521 is a wasteful number, since it uses less digits than its factorization.

53345521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2807678.

The product of its digits is 9000, while the sum is 28.

The square root of 53345521 is about 7303.8018182314. The cubic root of 53345521 is about 376.4430819522.

Adding to 53345521 its reverse (12554335), we get a palindrome (65899856).

The spelling of 53345521 in words is "fifty-three million, three hundred forty-five thousand, five hundred twenty-one".