51309256 has 16 divisors (see below), whose sum is σ = 96482700. Its totient is φ = 25580544.

The previous prime is 51309239. The next prime is 51309259. The reversal of 51309256 is 65290315.

51309256 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 48302500 + 3006756 = 6950^2 + 1734^2 .

It is not an unprimeable number, because it can be changed into a prime (51309259) 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, 6261 + ... + 11908.

Almost surely, 2^51309256 is an apocalyptic number.

It is an amenable number.

51309256 is a deficient number, since it is larger than the sum of its proper divisors (45173444).

51309256 is a wasteful number, since it uses less digits than its factorization.

51309256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18528 (or 18524 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 51309256 is about 7163.0479546070. The cubic root of 51309256 is about 371.5910447828.

The spelling of 51309256 in words is "fifty-one million, three hundred nine thousand, two hundred fifty-six".