51695865 has 48 divisors (see below), whose sum is σ = 101599680. Its totient is φ = 24105600.

The previous prime is 51695863. The next prime is 51695867. The reversal of 51695865 is 56859615.

It is a happy number.

51695865 is a `hidden beast` number, since 5 + 1 + 69 + 586 + 5 = 666.

51695865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (51695863) and next prime (51695867).

It is not a de Polignac number, because 51695865 - 2¹ = 51695863 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 51695865.

It is not an unprimeable number, because it can be changed into a prime (51695863) 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 47 ways as a sum of consecutive naturals, for example, 8790 + ... + 13440.

It is an arithmetic number, because the mean of its divisors is an integer number (2116660).

Almost surely, 2^51695865 is an apocalyptic number.

It is an amenable number.

51695865 is a deficient number, since it is larger than the sum of its proper divisors (49903815).

51695865 is a wasteful number, since it uses less digits than its factorization.

51695865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4694 (or 4691 counting only the distinct ones).

The product of its digits is 324000, while the sum is 45.

The square root of 51695865 is about 7189.9836578396. The cubic root of 51695865 is about 372.5220082188.

The spelling of 51695865 in words is "fifty-one million, six hundred ninety-five thousand, eight hundred sixty-five".