51617165 has 8 divisors (see below), whose sum is σ = 62183160. Its totient is φ = 41132032.

The previous prime is 51617123. The next prime is 51617173. The reversal of 51617165 is 56171615.

It can be written as a sum of positive squares in 4 ways, for example, as 35593156 + 16024009 = 5966^2 + 4003^2 .

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 51617165 - 2¹⁴ = 51600781 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18800 + ... + 21369.

It is an arithmetic number, because the mean of its divisors is an integer number (7772895).

Almost surely, 2^51617165 is an apocalyptic number.

It is an amenable number.

51617165 is a deficient number, since it is larger than the sum of its proper divisors (10565995).

51617165 is a wasteful number, since it uses less digits than its factorization.

51617165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40431.

The product of its digits is 6300, while the sum is 32.

The square root of 51617165 is about 7184.5086818794. The cubic root of 51617165 is about 372.3328739947.

The spelling of 51617165 in words is "fifty-one million, six hundred seventeen thousand, one hundred sixty-five".