52345521 has 20 divisors (see below), whose sum is σ = 78511092. Its totient is φ = 34756128.

The previous prime is 52345511. The next prime is 52345529. The reversal of 52345521 is 12554325.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13220496 + 39125025 = 3636^2 + 6255^2 .

It is not a de Polignac number, because 52345521 - 2⁶ = 52345457 is a prime.

It is a super-2 number, since 2×52345521² = 5480107137522882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52345529) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 21271 + ... + 23603.

Almost surely, 2^52345521 is an apocalyptic number.

It is an amenable number.

52345521 is a deficient number, since it is larger than the sum of its proper divisors (26165571).

52345521 is a wasteful number, since it uses less digits than its factorization.

52345521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2622 (or 2613 counting only the distinct ones).

The product of its digits is 6000, while the sum is 27.

The square root of 52345521 is about 7235.0204560872. The cubic root of 52345521 is about 374.0759971198.

Adding to 52345521 its reverse (12554325), we get a palindrome (64899846).

The spelling of 52345521 in words is "fifty-two million, three hundred forty-five thousand, five hundred twenty-one".