51561205 has 4 divisors (see below), whose sum is σ = 61873452. Its totient is φ = 41248960.

The previous prime is 51561203. The next prime is 51561233. The reversal of 51561205 is 50216515.

51561205 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 can be written as a sum of positive squares in 2 ways, for example, as 23746129 + 27815076 = 4873^2 + 5274^2 .

It is not a de Polignac number, because 51561205 - 2¹ = 51561203 is a prime.

It is a super-2 number, since 2×51561205² = 5317115722104050, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51561205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51561203) 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, 5156116 + ... + 5156125.

It is an arithmetic number, because the mean of its divisors is an integer number (15468363).

Almost surely, 2^51561205 is an apocalyptic number.

It is an amenable number.

51561205 is a deficient number, since it is larger than the sum of its proper divisors (10312247).

51561205 is a wasteful number, since it uses less digits than its factorization.

51561205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10312246.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 51561205 is about 7180.6131353806. The cubic root of 51561205 is about 372.1982722476.

The spelling of 51561205 in words is "fifty-one million, five hundred sixty-one thousand, two hundred five".