51968987 has 4 divisors (see below), whose sum is σ = 59393136. Its totient is φ = 44544840.

The previous prime is 51968977. The next prime is 51968993. The reversal of 51968987 is 78986915.

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 51968987 - 2⁸ = 51968731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51968977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3712064 + ... + 3712077.

It is an arithmetic number, because the mean of its divisors is an integer number (14848284).

Almost surely, 2^51968987 is an apocalyptic number.

51968987 is a deficient number, since it is larger than the sum of its proper divisors (7424149).

51968987 is an equidigital number, since it uses as much as digits as its factorization.

51968987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7424148.

The product of its digits is 1088640, while the sum is 53.

The square root of 51968987 is about 7208.9518655627. The cubic root of 51968987 is about 373.1768981249.

The spelling of 51968987 in words is "fifty-one million, nine hundred sixty-eight thousand, nine hundred eighty-seven".