51505133 has 4 divisors (see below), whose sum is σ = 51588960. Its totient is φ = 51421308.

The previous prime is 51505127. The next prime is 51505159. The reversal of 51505133 is 33150515.

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, and also an emirpimes, since its reverse is a distinct semiprime: 33150515 = 5 ⋅6630103.

It is a cyclic number.

It is not a de Polignac number, because 51505133 - 2²⁰ = 50456557 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51505099 and 51505108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51505123) 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, 40985 + ... + 42222.

It is an arithmetic number, because the mean of its divisors is an integer number (12897240).

Almost surely, 2^51505133 is an apocalyptic number.

It is an amenable number.

51505133 is a deficient number, since it is larger than the sum of its proper divisors (83827).

51505133 is an equidigital number, since it uses as much as digits as its factorization.

51505133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83826.

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

The square root of 51505133 is about 7176.7076713490. The cubic root of 51505133 is about 372.0633033867.

Adding to 51505133 its reverse (33150515), we get a palindrome (84655648).

The spelling of 51505133 in words is "fifty-one million, five hundred five thousand, one hundred thirty-three".