51649871 has 12 divisors (see below), whose sum is σ = 64705032. Its totient is φ = 40865328.

The previous prime is 51649867. The next prime is 51649877. The reversal of 51649871 is 17894615.

51649871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51649871 - 2² = 51649867 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51649877) 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 11 ways as a sum of consecutive naturals, for example, 39905 + ... + 41178.

It is an arithmetic number, because the mean of its divisors is an integer number (5392086).

Almost surely, 2^51649871 is an apocalyptic number.

51649871 is a deficient number, since it is larger than the sum of its proper divisors (13055161).

51649871 is a wasteful number, since it uses less digits than its factorization.

51649871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81110 (or 81103 counting only the distinct ones).

The product of its digits is 60480, while the sum is 41.

The square root of 51649871 is about 7186.7844687315. The cubic root of 51649871 is about 372.4114973743.

The spelling of 51649871 in words is "fifty-one million, six hundred forty-nine thousand, eight hundred seventy-one".