51361805 has 8 divisors (see below), whose sum is σ = 67237344. Its totient is φ = 37354000.

The previous prime is 51361799. The next prime is 51361847. The reversal of 51361805 is 50816315.

51361805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51361805 - 2⁸ = 51361549 is a prime.

It is a Duffinian number.

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 in 7 ways as a sum of consecutive naturals, for example, 466871 + ... + 466980.

It is an arithmetic number, because the mean of its divisors is an integer number (8404668).

Almost surely, 2^51361805 is an apocalyptic number.

51361805 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51361805 is a deficient number, since it is larger than the sum of its proper divisors (15875539).

51361805 is a wasteful number, since it uses less digits than its factorization.

51361805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 933867.

The product of its (nonzero) digits is 3600, while the sum is 29.

The square root of 51361805 is about 7166.7150773559. The cubic root of 51361805 is about 371.7178579997.

Subtracting from 51361805 its reverse (50816315), we obtain a triangular number (545490 = T₁₀₄₄).

The spelling of 51361805 in words is "fifty-one million, three hundred sixty-one thousand, eight hundred five".