51321916 has 6 divisors (see below), whose sum is σ = 89813360. Its totient is φ = 25660956.

The previous prime is 51321883. The next prime is 51321931. The reversal of 51321916 is 61912315.

51321916 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51321916² = 5267878123822112, which contains 22 as substring.

It is a zygodrome in base 2.

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, 6415236 + ... + 6415243.

Almost surely, 2^51321916 is an apocalyptic number.

It is an amenable number.

51321916 is a deficient number, since it is larger than the sum of its proper divisors (38491444).

51321916 is a wasteful number, since it uses less digits than its factorization.

51321916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12830483 (or 12830481 counting only the distinct ones).

The product of its digits is 1620, while the sum is 28.

The square root of 51321916 is about 7163.9316021302. The cubic root of 51321916 is about 371.6216042837.

The spelling of 51321916 in words is "fifty-one million, three hundred twenty-one thousand, nine hundred sixteen".