55103521 has 6 divisors (see below), whose sum is σ = 60568466. Its totient is φ = 50094000.

The previous prime is 55103519. The next prime is 55103537. The reversal of 55103521 is 12530155.

It can be written as a sum of positive squares in only one way, i.e., 33350625 + 21752896 = 5775^2 + 4664^2 .

It is not a de Polignac number, because 55103521 - 2¹ = 55103519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55103492 and 55103501.

It is not an unprimeable number, because it can be changed into a prime (55103501) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 227580 + ... + 227821.

Almost surely, 2^55103521 is an apocalyptic number.

It is an amenable number.

55103521 is a deficient number, since it is larger than the sum of its proper divisors (5464945).

55103521 is a wasteful number, since it uses less digits than its factorization.

55103521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455423 (or 455412 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 22.

The square root of 55103521 is about 7423.1745904296. The cubic root of 55103521 is about 380.5336937740.

Adding to 55103521 its reverse (12530155), we get a palindrome (67633676).

The spelling of 55103521 in words is "fifty-five million, one hundred three thousand, five hundred twenty-one".