51873818 has 4 divisors (see below), whose sum is σ = 77810730. Its totient is φ = 25936908.

The previous prime is 51873799. The next prime is 51873821. The reversal of 51873818 is 81837815.

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

It can be written as a sum of positive squares in only one way, i.e., 37908649 + 13965169 = 6157^2 + 3737^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 12968453 + ... + 12968456.

Almost surely, 2^51873818 is an apocalyptic number.

51873818 is a deficient number, since it is larger than the sum of its proper divisors (25936912).

51873818 is a wasteful number, since it uses less digits than its factorization.

51873818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25936911.

The product of its digits is 53760, while the sum is 41.

The square root of 51873818 is about 7202.3480893386. The cubic root of 51873818 is about 372.9489636368.

The spelling of 51873818 in words is "fifty-one million, eight hundred seventy-three thousand, eight hundred eighteen".