51445393 has 4 divisors (see below), whose sum is σ = 52170048. Its totient is φ = 50720740.

The previous prime is 51445357. The next prime is 51445421. The reversal of 51445393 is 39354415.

51445393 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51445393 - 2⁹ = 51444881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51445343) 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, 362221 + ... + 362362.

It is an arithmetic number, because the mean of its divisors is an integer number (13042512).

Almost surely, 2^51445393 is an apocalyptic number.

It is an amenable number.

51445393 is a deficient number, since it is larger than the sum of its proper divisors (724655).

51445393 is an equidigital number, since it uses as much as digits as its factorization.

51445393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724654.

The product of its digits is 32400, while the sum is 34.

The square root of 51445393 is about 7172.5443881513. The cubic root of 51445393 is about 371.9193975945.

The spelling of 51445393 in words is "fifty-one million, four hundred forty-five thousand, three hundred ninety-three".