51315646 has 8 divisors (see below), whose sum is σ = 77004144. Its totient is φ = 25647600.

The previous prime is 51315629. The next prime is 51315647. The reversal of 51315646 is 64651315.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51315647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5946 + ... + 11746.

It is an arithmetic number, because the mean of its divisors is an integer number (9625518).

Almost surely, 2^51315646 is an apocalyptic number.

51315646 is a deficient number, since it is larger than the sum of its proper divisors (25688498).

51315646 is a wasteful number, since it uses less digits than its factorization.

51315646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10226.

The product of its digits is 10800, while the sum is 31.

The square root of 51315646 is about 7163.4939798956. The cubic root of 51315646 is about 371.6064699932.

The spelling of 51315646 in words is "fifty-one million, three hundred fifteen thousand, six hundred forty-six".