55212533 has 4 divisors (see below), whose sum is σ = 55719180. Its totient is φ = 54705888.

The previous prime is 55212523. The next prime is 55212541. The reversal of 55212533 is 33521255.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22972849 + 32239684 = 4793^2 + 5678^2 .

It is a cyclic number.

It is not a de Polignac number, because 55212533 - 2¹⁰ = 55211509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55212523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253160 + ... + 253377.

It is an arithmetic number, because the mean of its divisors is an integer number (13929795).

Almost surely, 2^55212533 is an apocalyptic number.

It is an amenable number.

55212533 is a deficient number, since it is larger than the sum of its proper divisors (506647).

55212533 is a wasteful number, since it uses less digits than its factorization.

55212533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506646.

The product of its digits is 4500, while the sum is 26.

The square root of 55212533 is about 7430.5136430801. The cubic root of 55212533 is about 380.7844667011.

Adding to 55212533 its reverse (33521255), we get a palindrome (88733788).

The spelling of 55212533 in words is "fifty-five million, two hundred twelve thousand, five hundred thirty-three".