51008779 has 4 divisors (see below), whose sum is σ = 53226576. Its totient is φ = 48790984.

The previous prime is 51008777. The next prime is 51008791. The reversal of 51008779 is 97780015.

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

It is a cyclic number.

It is not a de Polignac number, because 51008779 - 2¹ = 51008777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51008777) 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 3 ways as a sum of consecutive naturals, for example, 1108864 + ... + 1108909.

It is an arithmetic number, because the mean of its divisors is an integer number (13306644).

Almost surely, 2^51008779 is an apocalyptic number.

51008779 is a deficient number, since it is larger than the sum of its proper divisors (2217797).

51008779 is a wasteful number, since it uses less digits than its factorization.

51008779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2217796.

The product of its (nonzero) digits is 17640, while the sum is 37.

The square root of 51008779 is about 7142.0430550368. The cubic root of 51008779 is about 370.8642543365.

The spelling of 51008779 in words is "fifty-one million, eight thousand, seven hundred seventy-nine".