51968918 has 4 divisors (see below), whose sum is σ = 77953380. Its totient is φ = 25984458.

The previous prime is 51968893. The next prime is 51968921. The reversal of 51968918 is 81986915.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12992228 + ... + 12992231.

It is an arithmetic number, because the mean of its divisors is an integer number (19488345).

Almost surely, 2^51968918 is an apocalyptic number.

51968918 is a deficient number, since it is larger than the sum of its proper divisors (25984462).

51968918 is a wasteful number, since it uses less digits than its factorization.

51968918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25984461.

The product of its digits is 155520, while the sum is 47.

The square root of 51968918 is about 7208.9470798446. The cubic root of 51968918 is about 373.1767329673.

The spelling of 51968918 in words is "fifty-one million, nine hundred sixty-eight thousand, nine hundred eighteen".