51868913 has 4 divisors (see below), whose sum is σ = 51923520. Its totient is φ = 51814308.

The previous prime is 51868877. The next prime is 51868937. The reversal of 51868913 is 31986815.

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 51868913 - 2¹⁰ = 51867889 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51858913) 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, 25853 + ... + 27786.

It is an arithmetic number, because the mean of its divisors is an integer number (12980880).

Almost surely, 2^51868913 is an apocalyptic number.

It is an amenable number.

51868913 is a deficient number, since it is larger than the sum of its proper divisors (54607).

51868913 is an equidigital number, since it uses as much as digits as its factorization.

51868913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54606.

The product of its digits is 51840, while the sum is 41.

The square root of 51868913 is about 7202.0075673384. The cubic root of 51868913 is about 372.9372083660.

The spelling of 51868913 in words is "fifty-one million, eight hundred sixty-eight thousand, nine hundred thirteen".