51718189 has 4 divisors (see below), whose sum is σ = 52818624. Its totient is φ = 50617756.

The previous prime is 51718187. The next prime is 51718229. The reversal of 51718189 is 98181715.

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 51718189 - 2¹ = 51718187 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 (51718181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550147 + ... + 550240.

It is an arithmetic number, because the mean of its divisors is an integer number (13204656).

Almost surely, 2^51718189 is an apocalyptic number.

It is an amenable number.

51718189 is a deficient number, since it is larger than the sum of its proper divisors (1100435).

51718189 is a wasteful number, since it uses less digits than its factorization.

51718189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100434.

The product of its digits is 20160, while the sum is 40.

The square root of 51718189 is about 7191.5359277417. The cubic root of 51718189 is about 372.5756229810.

The spelling of 51718189 in words is "fifty-one million, seven hundred eighteen thousand, one hundred eighty-nine".