51186561 has 8 divisors (see below), whose sum is σ = 68296320. Its totient is φ = 34100592.

The previous prime is 51186559. The next prime is 51186563. The reversal of 51186561 is 16568115.

It is an interprime number because it is at equal distance from previous prime (51186559) and next prime (51186563).

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

It is not a de Polignac number, because 51186561 - 2¹ = 51186559 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (51186563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105 + ... + 10118.

It is an arithmetic number, because the mean of its divisors is an integer number (8537040).

Almost surely, 2^51186561 is an apocalyptic number.

It is an amenable number.

51186561 is a deficient number, since it is larger than the sum of its proper divisors (17109759).

51186561 is a wasteful number, since it uses less digits than its factorization.

51186561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11895.

The product of its digits is 7200, while the sum is 33.

The square root of 51186561 is about 7154.4783876954. The cubic root of 51186561 is about 371.2946151417.

The spelling of 51186561 in words is "fifty-one million, one hundred eighty-six thousand, five hundred sixty-one".