51106681 has 8 divisors (see below), whose sum is σ = 52613064. Its totient is φ = 49620480.

The previous prime is 51106673. The next prime is 51106691. The reversal of 51106681 is 18660115.

It can be written as a sum of positive squares in 4 ways, for example, as 469225 + 50637456 = 685^2 + 7116^2 .

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 51106681 - 2³ = 51106673 is a prime.

It is a super-2 number, since 2×51106681² = 5223785685671522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51106691) 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, 171 + ... + 10111.

It is an arithmetic number, because the mean of its divisors is an integer number (6576633).

Almost surely, 2^51106681 is an apocalyptic number.

It is an amenable number.

51106681 is a deficient number, since it is larger than the sum of its proper divisors (1506383).

51106681 is an equidigital number, since it uses as much as digits as its factorization.

51106681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10091.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 51106681 is about 7148.8936906349. The cubic root of 51106681 is about 371.1013713491.

Adding to 51106681 its reverse (18660115), we get a palindrome (69766796).

The spelling of 51106681 in words is "fifty-one million, one hundred six thousand, six hundred eighty-one".