51746609 has 4 divisors (see below), whose sum is σ = 53145204. Its totient is φ = 50348016.

The previous prime is 51746537. The next prime is 51746627. The reversal of 51746609 is 90664715.

51746609 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 21529600 + 30217009 = 4640^2 + 5497^2 .

It is a cyclic number.

It is not a de Polignac number, because 51746609 - 2²⁰ = 50698033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51746689) 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, 699242 + ... + 699315.

It is an arithmetic number, because the mean of its divisors is an integer number (13286301).

Almost surely, 2^51746609 is an apocalyptic number.

It is an amenable number.

51746609 is a deficient number, since it is larger than the sum of its proper divisors (1398595).

51746609 is a wasteful number, since it uses less digits than its factorization.

51746609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1398594.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 51746609 is about 7193.5115903153. The cubic root of 51746609 is about 372.6438559726.

The spelling of 51746609 in words is "fifty-one million, seven hundred forty-six thousand, six hundred nine".