51445013 has 4 divisors (see below), whose sum is σ = 51600768. Its totient is φ = 51289260.

The previous prime is 51444973. The next prime is 51445019. The reversal of 51445013 is 31054415.

51445013 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 51445013 - 2⁶ = 51444949 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51445013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51445019) 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, 77381 + ... + 78042.

It is an arithmetic number, because the mean of its divisors is an integer number (12900192).

Almost surely, 2^51445013 is an apocalyptic number.

It is an amenable number.

51445013 is a deficient number, since it is larger than the sum of its proper divisors (155755).

51445013 is a wasteful number, since it uses less digits than its factorization.

51445013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155754.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 51445013 is about 7172.5178982000. The cubic root of 51445013 is about 371.9184818681.

Adding to 51445013 its reverse (31054415), we get a palindrome (82499428).

The spelling of 51445013 in words is "fifty-one million, four hundred forty-five thousand, thirteen".