51022809 has 24 divisors (see below), whose sum is σ = 80957760. Its totient is φ = 30821472.

The previous prime is 51022781. The next prime is 51022817. The reversal of 51022809 is 90822015.

51022809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51022809 - 2⁷ = 51022681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51022849) 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 23 ways as a sum of consecutive naturals, for example, 2554 + ... + 10419.

It is an arithmetic number, because the mean of its divisors is an integer number (3373240).

Almost surely, 2^51022809 is an apocalyptic number.

It is an amenable number.

51022809 is a deficient number, since it is larger than the sum of its proper divisors (29934951).

51022809 is a wasteful number, since it uses less digits than its factorization.

51022809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13021 (or 13018 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 51022809 is about 7143.0251994516. The cubic root of 51022809 is about 370.8982533762.

The spelling of 51022809 in words is "fifty-one million, twenty-two thousand, eight hundred nine".