51506511 has 16 divisors (see below), whose sum is σ = 82617600. Its totient is φ = 27883008.

The previous prime is 51506503. The next prime is 51506569. The reversal of 51506511 is 11560515.

It is not a de Polignac number, because 51506511 - 2³ = 51506503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51506011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64146 + ... + 64943.

It is an arithmetic number, because the mean of its divisors is an integer number (5163600).

Almost surely, 2^51506511 is an apocalyptic number.

51506511 is a deficient number, since it is larger than the sum of its proper divisors (31111089).

51506511 is a wasteful number, since it uses less digits than its factorization.

51506511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129118.

The product of its (nonzero) digits is 750, while the sum is 24.

The square root of 51506511 is about 7176.8036757320. The cubic root of 51506511 is about 372.0666214939.

The spelling of 51506511 in words is "fifty-one million, five hundred six thousand, five hundred eleven".