55253821 has 6 divisors (see below), whose sum is σ = 64274910. Its totient is φ = 47360376.

The previous prime is 55253801. The next prime is 55253827. The reversal of 55253821 is 12835255.

It can be written as a sum of positive squares in only one way, i.e., 51681721 + 3572100 = 7189^2 + 1890^2 .

It is not a de Polignac number, because 55253821 - 2⁹ = 55253309 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55253827) 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, 563766 + ... + 563863.

It is an arithmetic number, because the mean of its divisors is an integer number (10712485).

Almost surely, 2^55253821 is an apocalyptic number.

It is an amenable number.

55253821 is a deficient number, since it is larger than the sum of its proper divisors (9021089).

55253821 is a wasteful number, since it uses less digits than its factorization.

55253821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1127643 (or 1127636 counting only the distinct ones).

The product of its digits is 12000, while the sum is 31.

The square root of 55253821 is about 7433.2913974901. The cubic root of 55253821 is about 380.8793600819.

The spelling of 55253821 in words is "fifty-five million, two hundred fifty-three thousand, eight hundred twenty-one".