51809099 has 4 divisors (see below), whose sum is σ = 51828264. Its totient is φ = 51789936.

The previous prime is 51809083. The next prime is 51809101. The reversal of 51809099 is 99090815.

51809099 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.

It is a cyclic number.

It is not a de Polignac number, because 51809099 - 2⁴ = 51809083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51809039) 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, 4697 + ... + 11210.

It is an arithmetic number, because the mean of its divisors is an integer number (12957066).

Almost surely, 2^51809099 is an apocalyptic number.

51809099 is a deficient number, since it is larger than the sum of its proper divisors (19165).

51809099 is a wasteful number, since it uses less digits than its factorization.

51809099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19164.

The product of its (nonzero) digits is 29160, while the sum is 41.

The square root of 51809099 is about 7197.8537773422. The cubic root of 51809099 is about 372.7937991126.

The spelling of 51809099 in words is "fifty-one million, eight hundred nine thousand, ninety-nine".