51868387 has 4 divisors (see below), whose sum is σ = 51884136. Its totient is φ = 51852640.

The previous prime is 51868373. The next prime is 51868391. The reversal of 51868387 is 78386815.

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 51868387 - 2⁷ = 51868259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51868367) 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, 838 + ... + 10219.

It is an arithmetic number, because the mean of its divisors is an integer number (12971034).

Almost surely, 2^51868387 is an apocalyptic number.

51868387 is a deficient number, since it is larger than the sum of its proper divisors (15749).

51868387 is a wasteful number, since it uses less digits than its factorization.

51868387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15748.

The product of its digits is 322560, while the sum is 46.

The square root of 51868387 is about 7201.9710496502. The cubic root of 51868387 is about 372.9359477160.

The spelling of 51868387 in words is "fifty-one million, eight hundred sixty-eight thousand, three hundred eighty-seven".