51444487 has 4 divisors (see below), whose sum is σ = 52149280. Its totient is φ = 50739696.

The previous prime is 51444443. The next prime is 51444509. The reversal of 51444487 is 78444415.

It is a happy number.

51444487 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 is a cyclic number.

It is not a de Polignac number, because 51444487 - 2²³ = 43055879 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 (51444427) 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, 352287 + ... + 352432.

It is an arithmetic number, because the mean of its divisors is an integer number (13037320).

Almost surely, 2^51444487 is an apocalyptic number.

51444487 is a deficient number, since it is larger than the sum of its proper divisors (704793).

51444487 is an equidigital number, since it uses as much as digits as its factorization.

51444487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704792.

The product of its digits is 71680, while the sum is 37.

The square root of 51444487 is about 7172.4812303693. The cubic root of 51444487 is about 371.9172143025.

The spelling of 51444487 in words is "fifty-one million, four hundred forty-four thousand, four hundred eighty-seven".