51306805 has 16 divisors (see below), whose sum is σ = 67687488. Its totient is φ = 37024000.

The previous prime is 51306793. The next prime is 51306811. The reversal of 51306805 is 50860315.

51306805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51306805 - 2²⁵ = 17752373 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 3645 + ... + 10765.

It is an arithmetic number, because the mean of its divisors is an integer number (4230468).

Almost surely, 2^51306805 is an apocalyptic number.

51306805 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51306805 is a deficient number, since it is larger than the sum of its proper divisors (16380683).

51306805 is a wasteful number, since it uses less digits than its factorization.

51306805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7268.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 51306805 is about 7162.8768661760. The cubic root of 51306805 is about 371.5851278247.

It can be divided in two parts, 5130 and 6805, that added together give a triangular number (11935 = T₁₅₄).

The spelling of 51306805 in words is "fifty-one million, three hundred six thousand, eight hundred five".