51105521 has 8 divisors (see below), whose sum is σ = 51731784. Its totient is φ = 50483200.

The previous prime is 51105487. The next prime is 51105529. The reversal of 51105521 is 12550115.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18490000 + 32615521 = 4300^2 + 5711^2 .

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 51105521 - 2¹⁰ = 51104497 is a prime.

It is a super-2 number, since 2×51105521² = 5223548553362882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51105493 and 51105502.

It is not an unprimeable number, because it can be changed into a prime (51105529) 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, 31121 + ... + 32721.

It is an arithmetic number, because the mean of its divisors is an integer number (6466473).

Almost surely, 2^51105521 is an apocalyptic number.

It is an amenable number.

51105521 is a deficient number, since it is larger than the sum of its proper divisors (626263).

51105521 is a wasteful number, since it uses less digits than its factorization.

51105521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1971.

The product of its (nonzero) digits is 250, while the sum is 20.

The square root of 51105521 is about 7148.8125587401. The cubic root of 51105521 is about 371.0985636220.

Adding to 51105521 its reverse (12550115), we get a palindrome (63655636).

The spelling of 51105521 in words is "fifty-one million, one hundred five thousand, five hundred twenty-one".