55240133 has 4 divisors (see below), whose sum is σ = 59489388. Its totient is φ = 50990880.

The previous prime is 55240121. The next prime is 55240139. The reversal of 55240133 is 33104255.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33104255 = 5 ⋅6620851.

It can be written as a sum of positive squares in 2 ways, for example, as 24581764 + 30658369 = 4958^2 + 5537^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55240133 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 55240099 and 55240108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55240139) 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, 2124608 + ... + 2124633.

It is an arithmetic number, because the mean of its divisors is an integer number (14872347).

Almost surely, 2^55240133 is an apocalyptic number.

It is an amenable number.

55240133 is a deficient number, since it is larger than the sum of its proper divisors (4249255).

55240133 is a wasteful number, since it uses less digits than its factorization.

55240133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4249254.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 55240133 is about 7432.3706177773. The cubic root of 55240133 is about 380.8479058032.

Adding to 55240133 its reverse (33104255), we get a palindrome (88344388).

The spelling of 55240133 in words is "fifty-five million, two hundred forty thousand, one hundred thirty-three".