51288189 has 4 divisors (see below), whose sum is σ = 68384256. Its totient is φ = 34192124.

The previous prime is 51288187. The next prime is 51288197. The reversal of 51288189 is 98188215.

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 51288189 - 2¹ = 51288187 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 51288189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51288187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8548029 + ... + 8548034.

It is an arithmetic number, because the mean of its divisors is an integer number (17096064).

Almost surely, 2^51288189 is an apocalyptic number.

It is an amenable number.

51288189 is a deficient number, since it is larger than the sum of its proper divisors (17096067).

51288189 is a wasteful number, since it uses less digits than its factorization.

51288189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17096066.

The product of its digits is 46080, while the sum is 42.

The square root of 51288189 is about 7161.5772704063. The cubic root of 51288189 is about 371.5401807945.

The spelling of 51288189 in words is "fifty-one million, two hundred eighty-eight thousand, one hundred eighty-nine".