51201617 has 4 divisors (see below), whose sum is σ = 52967220. Its totient is φ = 49436016.

The previous prime is 51201613. The next prime is 51201643. The reversal of 51201617 is 71610215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71610215 = 5 ⋅14322043.

It can be written as a sum of positive squares in 2 ways, for example, as 22052416 + 29149201 = 4696^2 + 5399^2 .

It is a cyclic number.

It is not a de Polignac number, because 51201617 - 2² = 51201613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51201592 and 51201601.

It is not an unprimeable number, because it can be changed into a prime (51201613) 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 3 ways as a sum of consecutive naturals, for example, 882758 + ... + 882815.

It is an arithmetic number, because the mean of its divisors is an integer number (13241805).

Almost surely, 2^51201617 is an apocalyptic number.

It is an amenable number.

51201617 is a deficient number, since it is larger than the sum of its proper divisors (1765603).

51201617 is a wasteful number, since it uses less digits than its factorization.

51201617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1765602.

The product of its (nonzero) digits is 420, while the sum is 23.

The square root of 51201617 is about 7155.5305184172. The cubic root of 51201617 is about 371.3310157360.

The spelling of 51201617 in words is "fifty-one million, two hundred one thousand, six hundred seventeen".