51905713 has 4 divisors (see below), whose sum is σ = 53171748. Its totient is φ = 50639680.

The previous prime is 51905699. The next prime is 51905731. The reversal of 51905713 is 31750915.

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 3908529 + 47997184 = 1977^2 + 6928^2 .

It is a cyclic number.

It is not a de Polignac number, because 51905713 - 2⁹ = 51905201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51905753) 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, 632956 + ... + 633037.

It is an arithmetic number, because the mean of its divisors is an integer number (13292937).

Almost surely, 2^51905713 is an apocalyptic number.

It is an amenable number.

51905713 is a deficient number, since it is larger than the sum of its proper divisors (1266035).

51905713 is a wasteful number, since it uses less digits than its factorization.

51905713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266034.

The product of its (nonzero) digits is 4725, while the sum is 31.

The square root of 51905713 is about 7204.5619575377. The cubic root of 51905713 is about 373.0253847842.

The spelling of 51905713 in words is "fifty-one million, nine hundred five thousand, seven hundred thirteen".