51078909 has 16 divisors (see below), whose sum is σ = 79304832. Its totient is φ = 28636608.

The previous prime is 51078877. The next prime is 51078913. The reversal of 51078909 is 90987015.

It is a happy number.

It is not a de Polignac number, because 51078909 - 2⁵ = 51078877 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51078949) 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, 21834 + ... + 24059.

It is an arithmetic number, because the mean of its divisors is an integer number (4956552).

Almost surely, 2^51078909 is an apocalyptic number.

It is an amenable number.

51078909 is a deficient number, since it is larger than the sum of its proper divisors (28225923).

51078909 is a wasteful number, since it uses less digits than its factorization.

51078909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45956.

The product of its (nonzero) digits is 22680, while the sum is 39.

The square root of 51078909 is about 7146.9510282357. The cubic root of 51078909 is about 371.0341388172.

The spelling of 51078909 in words is "fifty-one million, seventy-eight thousand, nine hundred nine".