51648845 has 4 divisors (see below), whose sum is σ = 61978620. Its totient is φ = 41319072.

The previous prime is 51648841. The next prime is 51648847. The reversal of 51648845 is 54884615.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54884615 = 5 ⋅10976923.

It can be written as a sum of positive squares in 2 ways, for example, as 40271716 + 11377129 = 6346^2 + 3373^2 .

It is a cyclic number.

It is not a de Polignac number, because 51648845 - 2² = 51648841 is a prime.

It is a super-3 number, since 3×51648845³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51648841) 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, 5164880 + ... + 5164889.

It is an arithmetic number, because the mean of its divisors is an integer number (15494655).

Almost surely, 2^51648845 is an apocalyptic number.

It is an amenable number.

51648845 is a deficient number, since it is larger than the sum of its proper divisors (10329775).

51648845 is a wasteful number, since it uses less digits than its factorization.

51648845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10329774.

The product of its digits is 153600, while the sum is 41.

The square root of 51648845 is about 7186.7130873578. The cubic root of 51648845 is about 372.4090314325.

The spelling of 51648845 in words is "fifty-one million, six hundred forty-eight thousand, eight hundred forty-five".