51811982 has 4 divisors (see below), whose sum is σ = 77717976. Its totient is φ = 25905990.

The previous prime is 51811979. The next prime is 51812011. The reversal of 51811982 is 28911815.

51811982 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a super-3 number, since 3×51811982³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12952994 + ... + 12952997.

It is an arithmetic number, because the mean of its divisors is an integer number (19429494).

Almost surely, 2^51811982 is an apocalyptic number.

51811982 is a deficient number, since it is larger than the sum of its proper divisors (25905994).

51811982 is a wasteful number, since it uses less digits than its factorization.

51811982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25905993.

The product of its digits is 5760, while the sum is 35.

The square root of 51811982 is about 7198.0540425868. The cubic root of 51811982 is about 372.8007138863.

The spelling of 51811982 in words is "fifty-one million, eight hundred eleven thousand, nine hundred eighty-two".