51428909 has 8 divisors (see below), whose sum is σ = 58910400. Its totient is φ = 43981056.

The previous prime is 51428879. The next prime is 51428911. The reversal of 51428909 is 90982415.

51428909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51428909 - 2²⁴ = 34651693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51428959) 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 7 ways as a sum of consecutive naturals, for example, 5039 + ... + 11324.

It is an arithmetic number, because the mean of its divisors is an integer number (7363800).

Almost surely, 2^51428909 is an apocalyptic number.

It is an amenable number.

51428909 is a deficient number, since it is larger than the sum of its proper divisors (7481491).

51428909 is a wasteful number, since it uses less digits than its factorization.

51428909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16819.

The product of its (nonzero) digits is 25920, while the sum is 38.

The square root of 51428909 is about 7171.3951920111. The cubic root of 51428909 is about 371.8796702000.

The spelling of 51428909 in words is "fifty-one million, four hundred twenty-eight thousand, nine hundred nine".