51165505 has 8 divisors (see below), whose sum is σ = 61654824. Its totient is φ = 40761600.

The previous prime is 51165503. The next prime is 51165509. The reversal of 51165505 is 50556115.

It can be written as a sum of positive squares in 4 ways, for example, as 27468081 + 23697424 = 5241^2 + 4868^2 .

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

It is not a de Polignac number, because 51165505 - 2¹ = 51165503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51165503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20026 + ... + 22435.

It is an arithmetic number, because the mean of its divisors is an integer number (7706853).

Almost surely, 2^51165505 is an apocalyptic number.

It is an amenable number.

51165505 is a deficient number, since it is larger than the sum of its proper divisors (10489319).

51165505 is a wasteful number, since it uses less digits than its factorization.

51165505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42707.

The product of its (nonzero) digits is 3750, while the sum is 28.

The square root of 51165505 is about 7153.0067104680. The cubic root of 51165505 is about 371.2436964923.

The spelling of 51165505 in words is "fifty-one million, one hundred sixty-five thousand, five hundred five".