51678523 has 4 divisors (see below), whose sum is σ = 55653808. Its totient is φ = 47703240.

The previous prime is 51678503. The next prime is 51678527. The reversal of 51678523 is 32587615.

51678523 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, and also an emirpimes, since its reverse is a distinct semiprime: 32587615 = 5 ⋅6517523.

It is a de Polignac number, because none of the positive numbers 2^k-51678523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51678527) 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 3 ways as a sum of consecutive naturals, for example, 1987623 + ... + 1987648.

It is an arithmetic number, because the mean of its divisors is an integer number (13913452).

Almost surely, 2^51678523 is an apocalyptic number.

51678523 is a deficient number, since it is larger than the sum of its proper divisors (3975285).

51678523 is a wasteful number, since it uses less digits than its factorization.

51678523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3975284.

The product of its digits is 50400, while the sum is 37.

The square root of 51678523 is about 7188.7775734126. Note that the first 3 decimals coincide. The cubic root of 51678523 is about 372.4803478965.

The spelling of 51678523 in words is "fifty-one million, six hundred seventy-eight thousand, five hundred twenty-three".