51930187 has 4 divisors (see below), whose sum is σ = 51967240. Its totient is φ = 51893136.

The previous prime is 51930163. The next prime is 51930199. The reversal of 51930187 is 78103915.

It is a happy number.

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 51930187 - 2¹⁹ = 51405899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51930127) 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, 16338 + ... + 19255.

It is an arithmetic number, because the mean of its divisors is an integer number (12991810).

Almost surely, 2^51930187 is an apocalyptic number.

51930187 is a deficient number, since it is larger than the sum of its proper divisors (37053).

51930187 is a wasteful number, since it uses less digits than its factorization.

51930187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37052.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 51930187 is about 7206.2602645200. The cubic root of 51930187 is about 373.0840038215.

The spelling of 51930187 in words is "fifty-one million, nine hundred thirty thousand, one hundred eighty-seven".