55502821 has 6 divisors (see below), whose sum is σ = 61007366. Its totient is φ = 50457000.

The previous prime is 55502801. The next prime is 55502827. The reversal of 55502821 is 12820555.

It can be written as a sum of positive squares in only one way, i.e., 54316900 + 1185921 = 7370^2 + 1089^2 .

It is not a de Polignac number, because 55502821 - 2⁵ = 55502789 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 55502821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55502827) 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 5 ways as a sum of consecutive naturals, for example, 229230 + ... + 229471.

Almost surely, 2^55502821 is an apocalyptic number.

It is an amenable number.

55502821 is a deficient number, since it is larger than the sum of its proper divisors (5504545).

55502821 is a wasteful number, since it uses less digits than its factorization.

55502821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458723 (or 458712 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 28.

The square root of 55502821 is about 7450.0215435930. The cubic root of 55502821 is about 381.4506439702.

The spelling of 55502821 in words is "fifty-five million, five hundred two thousand, eight hundred twenty-one".