51606217 has 4 divisors (see below), whose sum is σ = 55575940. Its totient is φ = 47636496.

The previous prime is 51606211. The next prime is 51606221. The reversal of 51606217 is 71260615.

51606217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 22240656 + 29365561 = 4716^2 + 5419^2 .

It is a cyclic number.

It is not a de Polignac number, because 51606217 - 2³ = 51606209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51606211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1984842 + ... + 1984867.

It is an arithmetic number, because the mean of its divisors is an integer number (13893985).

Almost surely, 2^51606217 is an apocalyptic number.

It is an amenable number.

51606217 is a deficient number, since it is larger than the sum of its proper divisors (3969723).

51606217 is a wasteful number, since it uses less digits than its factorization.

51606217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3969722.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 51606217 is about 7183.7467243772. The cubic root of 51606217 is about 372.3065482008.

The spelling of 51606217 in words is "fifty-one million, six hundred six thousand, two hundred seventeen".