51655521 has 8 divisors (see below), whose sum is σ = 69024640. Its totient is φ = 34361712.

The previous prime is 51655519. The next prime is 51655523. The reversal of 51655521 is 12555615.

It is an interprime number because it is at equal distance from previous prime (51655519) and next prime (51655523).

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

It is not a de Polignac number, because 51655521 - 2¹ = 51655519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51655523) 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, 17206 + ... + 19983.

It is an arithmetic number, because the mean of its divisors is an integer number (8628080).

Almost surely, 2^51655521 is an apocalyptic number.

It is an amenable number.

51655521 is a deficient number, since it is larger than the sum of its proper divisors (17369119).

51655521 is a wasteful number, since it uses less digits than its factorization.

51655521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37655.

The product of its digits is 7500, while the sum is 30.

The square root of 51655521 is about 7187.1775405927. The cubic root of 51655521 is about 372.4250762933.

The spelling of 51655521 in words is "fifty-one million, six hundred fifty-five thousand, five hundred twenty-one".