51711505 has 4 divisors (see below), whose sum is σ = 62053812. Its totient is φ = 41369200.

The previous prime is 51711497. The next prime is 51711509. The reversal of 51711505 is 50511715.

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 18395521 + 33315984 = 4289^2 + 5772^2 .

It is not a de Polignac number, because 51711505 - 2³ = 51711497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51711505.

It is not an unprimeable number, because it can be changed into a prime (51711509) 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, 5171146 + ... + 5171155.

It is an arithmetic number, because the mean of its divisors is an integer number (15513453).

Almost surely, 2^51711505 is an apocalyptic number.

It is an amenable number.

51711505 is a deficient number, since it is larger than the sum of its proper divisors (10342307).

51711505 is a wasteful number, since it uses less digits than its factorization.

51711505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10342306.

The product of its (nonzero) digits is 875, while the sum is 25.

The square root of 51711505 is about 7191.0711997588. The cubic root of 51711505 is about 372.5595718727.

The spelling of 51711505 in words is "fifty-one million, seven hundred eleven thousand, five hundred five".