51644319 has 4 divisors (see below), whose sum is σ = 68859096. Its totient is φ = 34429544.

The previous prime is 51644311. The next prime is 51644321. The reversal of 51644319 is 91344615.

51644319 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 51644319 - 2³ = 51644311 is a prime.

It is a super-2 number, since 2×51644319² = 5334271369947522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51644319.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51644311) 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, 8607384 + ... + 8607389.

It is an arithmetic number, because the mean of its divisors is an integer number (17214774).

Almost surely, 2^51644319 is an apocalyptic number.

51644319 is a deficient number, since it is larger than the sum of its proper divisors (17214777).

51644319 is a wasteful number, since it uses less digits than its factorization.

51644319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17214776.

The product of its digits is 12960, while the sum is 33.

The square root of 51644319 is about 7186.3981938103. The cubic root of 51644319 is about 372.3981530188.

The spelling of 51644319 in words is "fifty-one million, six hundred forty-four thousand, three hundred nineteen".