51387065 has 4 divisors (see below), whose sum is σ = 61664484. Its totient is φ = 41109648.

The previous prime is 51387059. The next prime is 51387097. The reversal of 51387065 is 56078315.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 35808256 + 15578809 = 5984^2 + 3947^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51387065 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

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, 5138702 + ... + 5138711.

It is an arithmetic number, because the mean of its divisors is an integer number (15416121).

Almost surely, 2^51387065 is an apocalyptic number.

It is an amenable number.

51387065 is a deficient number, since it is larger than the sum of its proper divisors (10277419).

51387065 is a wasteful number, since it uses less digits than its factorization.

51387065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10277418.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 51387065 is about 7168.4771744074. The cubic root of 51387065 is about 371.7787855977.

It can be divided in two parts, 513 and 87065, that added together give a palindrome (87578).

The spelling of 51387065 in words is "fifty-one million, three hundred eighty-seven thousand, sixty-five".