51228609 has 16 divisors (see below), whose sum is σ = 71788992. Its totient is φ = 32453568.

The previous prime is 51228607. The next prime is 51228623. The reversal of 51228609 is 90682215.

It is not a de Polignac number, because 51228609 - 2¹ = 51228607 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51228609.

It is not an unprimeable number, because it can be changed into a prime (51228607) 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, 594 + ... + 10139.

It is an arithmetic number, because the mean of its divisors is an integer number (4486812).

Almost surely, 2^51228609 is an apocalyptic number.

It is an amenable number.

51228609 is a deficient number, since it is larger than the sum of its proper divisors (20560383).

51228609 is a wasteful number, since it uses less digits than its factorization.

51228609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10816.

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

The square root of 51228609 is about 7157.4163634652. The cubic root of 51228609 is about 371.3962559022.

It can be divided in two parts, 5122 and 8609, that added together give a palindrome (13731).

The spelling of 51228609 in words is "fifty-one million, two hundred twenty-eight thousand, six hundred nine".