51384865 has 16 divisors (see below), whose sum is σ = 71972352. Its totient is φ = 34484544.

The previous prime is 51384859. The next prime is 51384869. The reversal of 51384865 is 56848315.

It is a cyclic number.

It is not a de Polignac number, because 51384865 - 2³ = 51384857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51384869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13974 + ... + 17263.

It is an arithmetic number, because the mean of its divisors is an integer number (4498272).

Almost surely, 2^51384865 is an apocalyptic number.

It is an amenable number.

51384865 is a deficient number, since it is larger than the sum of its proper divisors (20587487).

51384865 is a wasteful number, since it uses less digits than its factorization.

51384865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31296.

The product of its digits is 115200, while the sum is 40.

The square root of 51384865 is about 7168.3237231587. The cubic root of 51384865 is about 371.7734799499.

The spelling of 51384865 in words is "fifty-one million, three hundred eighty-four thousand, eight hundred sixty-five".