55872133 has 4 divisors (see below), whose sum is σ = 55955340. Its totient is φ = 55788928.

The previous prime is 55872127. The next prime is 55872161. The reversal of 55872133 is 33127855.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33127855 = 5 ⋅6625571.

It can be written as a sum of positive squares in 2 ways, for example, as 39727809 + 16144324 = 6303^2 + 4018^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55872133 is a prime.

It is a super-3 number, since 3×55872133³ (a number of 24 digits) contains 333 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 (55872163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40588 + ... + 41941.

It is an arithmetic number, because the mean of its divisors is an integer number (13988835).

Almost surely, 2^55872133 is an apocalyptic number.

It is an amenable number.

55872133 is a deficient number, since it is larger than the sum of its proper divisors (83207).

55872133 is an equidigital number, since it uses as much as digits as its factorization.

55872133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83206.

The product of its digits is 25200, while the sum is 34.

The square root of 55872133 is about 7474.7664177551. The cubic root of 55872133 is about 382.2948232486.

Adding to 55872133 its reverse (33127855), we get a palindrome (88999988).

The spelling of 55872133 in words is "fifty-five million, eight hundred seventy-two thousand, one hundred thirty-three".