51312785 has 4 divisors (see below), whose sum is σ = 61575348. Its totient is φ = 41050224.

The previous prime is 51312761. The next prime is 51312809. The reversal of 51312785 is 58721315.

51312785 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (51312761) and next prime (51312809).

It can be written as a sum of positive squares in 2 ways, for example, as 16785409 + 34527376 = 4097^2 + 5876^2 .

It is a cyclic number.

It is not a de Polignac number, because 51312785 - 2⁶ = 51312721 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5131274 + ... + 5131283.

It is an arithmetic number, because the mean of its divisors is an integer number (15393837).

Almost surely, 2^51312785 is an apocalyptic number.

It is an amenable number.

51312785 is a deficient number, since it is larger than the sum of its proper divisors (10262563).

51312785 is a wasteful number, since it uses less digits than its factorization.

51312785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10262562.

The product of its digits is 8400, while the sum is 32.

The square root of 51312785 is about 7163.2942840567. The cubic root of 51312785 is about 371.5995638093.

The spelling of 51312785 in words is "fifty-one million, three hundred twelve thousand, seven hundred eighty-five".