51286209 has 16 divisors (see below), whose sum is σ = 73984512. Its totient is φ = 31413888.

The previous prime is 51286199. The next prime is 51286217. The reversal of 51286209 is 90268215.

It is not a de Polignac number, because 51286209 - 2⁸ = 51285953 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51286209.

It is not an unprimeable number, because it can be changed into a prime (51286219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5749 + ... + 11645.

It is an arithmetic number, because the mean of its divisors is an integer number (4624032).

Almost surely, 2^51286209 is an apocalyptic number.

It is an amenable number.

51286209 is a deficient number, since it is larger than the sum of its proper divisors (22698303).

51286209 is a wasteful number, since it uses less digits than its factorization.

51286209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6136.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 51286209 is about 7161.4390313679. The cubic root of 51286209 is about 371.5353995831.

The spelling of 51286209 in words is "fifty-one million, two hundred eighty-six thousand, two hundred nine".