51550133 has 4 divisors (see below), whose sum is σ = 52023180. Its totient is φ = 51077088.

The previous prime is 51550099. The next prime is 51550159. The reversal of 51550133 is 33105515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33105515 = 5 ⋅6621103.

It can be written as a sum of positive squares in 2 ways, for example, as 37246609 + 14303524 = 6103^2 + 3782^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51550133 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51550099 and 51550108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51550183) 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, 236360 + ... + 236577.

It is an arithmetic number, because the mean of its divisors is an integer number (13005795).

Almost surely, 2^51550133 is an apocalyptic number.

It is an amenable number.

51550133 is a deficient number, since it is larger than the sum of its proper divisors (473047).

51550133 is a wasteful number, since it uses less digits than its factorization.

51550133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473046.

The product of its (nonzero) digits is 1125, while the sum is 23.

The square root of 51550133 is about 7179.8421291836. The cubic root of 51550133 is about 372.1716289973.

Adding to 51550133 its reverse (33105515), we get a palindrome (84655648).

The spelling of 51550133 in words is "fifty-one million, five hundred fifty thousand, one hundred thirty-three".