51993365 has 4 divisors (see below), whose sum is σ = 62392044. Its totient is φ = 41594688.

The previous prime is 51993353. The next prime is 51993391. The reversal of 51993365 is 56339915.

51993365 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 26450449 + 25542916 = 5143^2 + 5054^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51993365 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 5199332 + ... + 5199341.

It is an arithmetic number, because the mean of its divisors is an integer number (15598011).

Almost surely, 2^51993365 is an apocalyptic number.

It is an amenable number.

51993365 is a deficient number, since it is larger than the sum of its proper divisors (10398679).

51993365 is a wasteful number, since it uses less digits than its factorization.

51993365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10398678.

The product of its digits is 109350, while the sum is 41.

The square root of 51993365 is about 7210.6424817765. The cubic root of 51993365 is about 373.2352398709.

The spelling of 51993365 in words is "fifty-one million, nine hundred ninety-three thousand, three hundred sixty-five".