51008805 has 16 divisors (see below), whose sum is σ = 90682560. Its totient is φ = 27204624.

The previous prime is 51008803. The next prime is 51008807. The reversal of 51008805 is 50880015.

It is an interprime number because it is at equal distance from previous prime (51008803) and next prime (51008807).

It is not a de Polignac number, because 51008805 - 2¹ = 51008803 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51008801) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 188787 + ... + 189056.

It is an arithmetic number, because the mean of its divisors is an integer number (5667660).

Almost surely, 2^51008805 is an apocalyptic number.

It is an amenable number.

51008805 is a deficient number, since it is larger than the sum of its proper divisors (39673755).

51008805 is a wasteful number, since it uses less digits than its factorization.

51008805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377857 (or 377851 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 27.

The square root of 51008805 is about 7142.0448752441. The cubic root of 51008805 is about 370.8643173483.

The spelling of 51008805 in words is "fifty-one million, eight thousand, eight hundred five".