51184421 has 4 divisors (see below), whose sum is σ = 51198732. Its totient is φ = 51170112.

The previous prime is 51184417. The next prime is 51184439. The reversal of 51184421 is 12448115.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 47128225 + 4056196 = 6865^2 + 2014^2 .

It is a cyclic number.

It is not a de Polignac number, because 51184421 - 2² = 51184417 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 (51184411) 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, 3431 + ... + 10683.

It is an arithmetic number, because the mean of its divisors is an integer number (12799683).

Almost surely, 2^51184421 is an apocalyptic number.

It is an amenable number.

51184421 is a deficient number, since it is larger than the sum of its proper divisors (14311).

51184421 is an equidigital number, since it uses as much as digits as its factorization.

51184421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14310.

The product of its digits is 1280, while the sum is 26.

The square root of 51184421 is about 7154.3288294570. The cubic root of 51184421 is about 371.2894407266.

The spelling of 51184421 in words is "fifty-one million, one hundred eighty-four thousand, four hundred twenty-one".