51391441 has 4 divisors (see below), whose sum is σ = 51736500. Its totient is φ = 51046384.

The previous prime is 51391427. The next prime is 51391469. The reversal of 51391441 is 14419315.

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 12453841 + 38937600 = 3529^2 + 6240^2 .

It is a cyclic number.

It is not a de Polignac number, because 51391441 - 2⁷ = 51391313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51391421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172306 + ... + 172603.

It is an arithmetic number, because the mean of its divisors is an integer number (12934125).

Almost surely, 2^51391441 is an apocalyptic number.

It is an amenable number.

51391441 is a deficient number, since it is larger than the sum of its proper divisors (345059).

51391441 is a wasteful number, since it uses less digits than its factorization.

51391441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345058.

The product of its digits is 2160, while the sum is 28.

The square root of 51391441 is about 7168.7823931265. The cubic root of 51391441 is about 371.7893385633.

The spelling of 51391441 in words is "fifty-one million, three hundred ninety-one thousand, four hundred forty-one".