55209733 has 4 divisors (see below), whose sum is σ = 55242880. Its totient is φ = 55176588.

The previous prime is 55209719. The next prime is 55209743. The reversal of 55209733 is 33790255.

55209733 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55209733 is a prime.

It is a super-2 number, since 2×55209733² = 6096229235862578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55209743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13935 + ... + 17452.

It is an arithmetic number, because the mean of its divisors is an integer number (13810720).

Almost surely, 2^55209733 is an apocalyptic number.

It is an amenable number.

55209733 is a deficient number, since it is larger than the sum of its proper divisors (33147).

55209733 is a wasteful number, since it uses less digits than its factorization.

55209733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33146.

The product of its (nonzero) digits is 28350, while the sum is 34.

The square root of 55209733 is about 7430.3252284136. The cubic root of 55209733 is about 380.7780296691.

Adding to 55209733 its reverse (33790255), we get a palindrome (88999988).

The spelling of 55209733 in words is "fifty-five million, two hundred nine thousand, seven hundred thirty-three".