51697230 has 64 divisors (see below), whose sum is σ = 135571968. Its totient is φ = 12539520.

The previous prime is 51697201. The next prime is 51697237. The reversal of 51697230 is 3279615.

51697230 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51697191 and 51697200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51697237) 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 31 ways as a sum of consecutive naturals, for example, 26757 + ... + 28623.

It is an arithmetic number, because the mean of its divisors is an integer number (2118312).

Almost surely, 2^51697230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51697230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67785984).

51697230 is an abundant number, since it is smaller than the sum of its proper divisors (83874738).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51697230 is a wasteful number, since it uses less digits than its factorization.

51697230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1961.

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 51697230 is about 7190.0785809336. The cubic root of 51697230 is about 372.5252869340.

The spelling of 51697230 in words is "fifty-one million, six hundred ninety-seven thousand, two hundred thirty".