51561927 has 24 divisors (see below), whose sum is σ = 78414336. Its totient is φ = 33850872.

The previous prime is 51561919. The next prime is 51561973. The reversal of 51561927 is 72916515.

51561927 is a `hidden beast` number, since 5 + 1 + 561 + 92 + 7 = 666.

51561927 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51561927 - 2³ = 51561919 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51561891 and 51561900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51561907) 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 23 ways as a sum of consecutive naturals, for example, 14698 + ... + 17864.

It is an arithmetic number, because the mean of its divisors is an integer number (3267264).

Almost surely, 2^51561927 is an apocalyptic number.

51561927 is a deficient number, since it is larger than the sum of its proper divisors (26852409).

51561927 is an equidigital number, since it uses as much as digits as its factorization.

51561927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3249 (or 3237 counting only the distinct ones).

The product of its digits is 18900, while the sum is 36.

The square root of 51561927 is about 7180.6634094629. The cubic root of 51561927 is about 372.2000095092.

The spelling of 51561927 in words is "fifty-one million, five hundred sixty-one thousand, nine hundred twenty-seven".