51506311 has 16 divisors (see below), whose sum is σ = 55883520. Its totient is φ = 47295360.

The previous prime is 51506309. The next prime is 51506327. The reversal of 51506311 is 11360515.

51506311 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51506311 - 2¹ = 51506309 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 (51506381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167620 + ... + 167926.

It is an arithmetic number, because the mean of its divisors is an integer number (3492720).

Almost surely, 2^51506311 is an apocalyptic number.

51506311 is a deficient number, since it is larger than the sum of its proper divisors (4377209).

51506311 is a wasteful number, since it uses less digits than its factorization.

51506311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 51506311 is about 7176.7897419389. The cubic root of 51506311 is about 372.0661399145.

Adding to 51506311 its reverse (11360515), we get a palindrome (62866826).

The spelling of 51506311 in words is "fifty-one million, five hundred six thousand, three hundred eleven".