51228187 has 4 divisors (see below), whose sum is σ = 51279480. Its totient is φ = 51176896.

The previous prime is 51228173. The next prime is 51228209. The reversal of 51228187 is 78182215.

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 51228187 - 2⁷ = 51228059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51228127) 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, 24118 + ... + 26155.

It is an arithmetic number, because the mean of its divisors is an integer number (12819870).

Almost surely, 2^51228187 is an apocalyptic number.

51228187 is a deficient number, since it is larger than the sum of its proper divisors (51293).

51228187 is a wasteful number, since it uses less digits than its factorization.

51228187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51292.

The product of its digits is 8960, while the sum is 34.

The square root of 51228187 is about 7157.3868834932. The cubic root of 51228187 is about 371.3952360968.

It can be divided in two parts, 51228 and 187, that added together give a palindrome (51415).

The spelling of 51228187 in words is "fifty-one million, two hundred twenty-eight thousand, one hundred eighty-seven".