51305071 has 4 divisors (see below), whose sum is σ = 51813144. Its totient is φ = 50797000.

The previous prime is 51305047. The next prime is 51305077. The reversal of 51305071 is 17050315.

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

It is a cyclic number.

It is not a de Polignac number, because 51305071 - 2⁷ = 51304943 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 (51305077) 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, 253885 + ... + 254086.

It is an arithmetic number, because the mean of its divisors is an integer number (12953286).

Almost surely, 2^51305071 is an apocalyptic number.

51305071 is a deficient number, since it is larger than the sum of its proper divisors (508073).

51305071 is a wasteful number, since it uses less digits than its factorization.

51305071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508072.

The product of its (nonzero) digits is 525, while the sum is 22.

The square root of 51305071 is about 7162.7558244017. The cubic root of 51305071 is about 371.5809416622.

Adding to 51305071 its reverse (17050315), we get a palindrome (68355386).

It can be divided in two parts, 5130 and 5071, that added together give a palindrome (10201).

The spelling of 51305071 in words is "fifty-one million, three hundred five thousand, seventy-one".