51428569 has 4 divisors (see below), whose sum is σ = 51487696. Its totient is φ = 51369444.

The previous prime is 51428539. The next prime is 51428581. The reversal of 51428569 is 96582415.

51428569 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51428569 - 2⁷ = 51428441 is a prime.

It is a super-2 number, since 2×51428569² = 5289795418775522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51428539) 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 3 ways as a sum of consecutive naturals, for example, 28239 + ... + 30004.

It is an arithmetic number, because the mean of its divisors is an integer number (12871924).

Almost surely, 2^51428569 is an apocalyptic number.

It is an amenable number.

51428569 is a deficient number, since it is larger than the sum of its proper divisors (59127).

51428569 is an equidigital number, since it uses as much as digits as its factorization.

51428569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59126.

The product of its digits is 86400, while the sum is 40.

The square root of 51428569 is about 7171.3714866823. The cubic root of 51428569 is about 371.8788506910.

The spelling of 51428569 in words is "fifty-one million, four hundred twenty-eight thousand, five hundred sixty-nine".