51530863 has 4 divisors (see below), whose sum is σ = 51644080. Its totient is φ = 51417648.

The previous prime is 51530849. The next prime is 51530867. The reversal of 51530863 is 36803515.

51530863 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51530863 - 2⁹ = 51530351 is a prime.

It is the 7179-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51530867) by changing a digit.

It is a nontrivial repunit in base 7178.

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 3 ways as a sum of consecutive naturals, for example, 55923 + ... + 56836.

It is an arithmetic number, because the mean of its divisors is an integer number (12911020).

Almost surely, 2^51530863 is an apocalyptic number.

51530863 is a deficient number, since it is larger than the sum of its proper divisors (113217).

51530863 is a wasteful number, since it uses less digits than its factorization.

51530863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113216.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 51530863 is about 7178.5000522393. The cubic root of 51530863 is about 372.1252492844.

The spelling of 51530863 in words is "fifty-one million, five hundred thirty thousand, eight hundred sixty-three".