51533165 has 4 divisors (see below), whose sum is σ = 61839804. Its totient is φ = 41226528.

The previous prime is 51533161. The next prime is 51533189. The reversal of 51533165 is 56133515.

51533165 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.

It can be written as a sum of positive squares in 2 ways, for example, as 7946761 + 43586404 = 2819^2 + 6602^2 .

It is a cyclic number.

It is not a de Polignac number, because 51533165 - 2² = 51533161 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51533161) 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, 5153312 + ... + 5153321.

It is an arithmetic number, because the mean of its divisors is an integer number (15459951).

Almost surely, 2^51533165 is an apocalyptic number.

It is an amenable number.

51533165 is a deficient number, since it is larger than the sum of its proper divisors (10306639).

51533165 is a wasteful number, since it uses less digits than its factorization.

51533165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10306638.

The product of its digits is 6750, while the sum is 29.

The square root of 51533165 is about 7178.6603903514. The cubic root of 51533165 is about 372.1307904269.

The spelling of 51533165 in words is "fifty-one million, five hundred thirty-three thousand, one hundred sixty-five".