51675815 has 4 divisors (see below), whose sum is σ = 62010984. Its totient is φ = 41340648.

The previous prime is 51675797. The next prime is 51675817. The reversal of 51675815 is 51857615.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51675815 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51675817) 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, 5167577 + ... + 5167586.

It is an arithmetic number, because the mean of its divisors is an integer number (15502746).

Almost surely, 2^51675815 is an apocalyptic number.

51675815 is a deficient number, since it is larger than the sum of its proper divisors (10335169).

51675815 is a wasteful number, since it uses less digits than its factorization.

51675815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10335168.

The product of its digits is 42000, while the sum is 38.

The square root of 51675815 is about 7188.5892218154. The cubic root of 51675815 is about 372.4738416837.

The spelling of 51675815 in words is "fifty-one million, six hundred seventy-five thousand, eight hundred fifteen".