51286609 has 4 divisors (see below), whose sum is σ = 55949040. Its totient is φ = 46624180.

The previous prime is 51286607. The next prime is 51286657. The reversal of 51286609 is 90668215.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51286609 - 2¹ = 51286607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51286607) 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, 2331199 + ... + 2331220.

It is an arithmetic number, because the mean of its divisors is an integer number (13987260).

Almost surely, 2^51286609 is an apocalyptic number.

It is an amenable number.

51286609 is a deficient number, since it is larger than the sum of its proper divisors (4662431).

51286609 is a wasteful number, since it uses less digits than its factorization.

51286609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4662430.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 51286609 is about 7161.4669586615. The cubic root of 51286609 is about 371.5363654943.

The spelling of 51286609 in words is "fifty-one million, two hundred eighty-six thousand, six hundred nine".