51256505 has 8 divisors (see below), whose sum is σ = 61773192. Its totient is φ = 40828288.

The previous prime is 51256483. The next prime is 51256511. The reversal of 51256505 is 50565215.

51256505 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 4 ways, for example, as 33856 + 51222649 = 184^2 + 7157^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51256505 - 2⁶ = 51256441 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 20834 + ... + 23163.

It is an arithmetic number, because the mean of its divisors is an integer number (7721649).

Almost surely, 2^51256505 is an apocalyptic number.

It is an amenable number.

51256505 is a deficient number, since it is larger than the sum of its proper divisors (10516687).

51256505 is a wasteful number, since it uses less digits than its factorization.

51256505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44235.

The product of its (nonzero) digits is 7500, while the sum is 29.

The square root of 51256505 is about 7159.3648461299. The cubic root of 51256505 is about 371.4636569773.

The spelling of 51256505 in words is "fifty-one million, two hundred fifty-six thousand, five hundred five".