51106561 has 8 divisors (see below), whose sum is σ = 58687200. Its totient is φ = 44015040.

The previous prime is 51106543. The next prime is 51106571. The reversal of 51106561 is 16560115.

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 51106561 - 2¹¹ = 51104513 is a prime.

It is a super-2 number, since 2×51106561² = 5223761154493442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51106501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122056 + ... + 122473.

It is an arithmetic number, because the mean of its divisors is an integer number (7335900).

Almost surely, 2^51106561 is an apocalyptic number.

It is an amenable number.

51106561 is a deficient number, since it is larger than the sum of its proper divisors (7580639).

51106561 is a wasteful number, since it uses less digits than its factorization.

51106561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244559.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 51106561 is about 7148.8852977230. The cubic root of 51106561 is about 371.1010808966.

Adding to 51106561 its reverse (16560115), we get a palindrome (67666676).

The spelling of 51106561 in words is "fifty-one million, one hundred six thousand, five hundred sixty-one".