51008139 has 48 divisors (see below), whose sum is σ = 92257984. Its totient is φ = 26438400.

The previous prime is 51008137. The next prime is 51008171. The reversal of 51008139 is 93180015.

It is not a de Polignac number, because 51008139 - 2¹ = 51008137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51008137) 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 47 ways as a sum of consecutive naturals, for example, 49449 + ... + 50469.

Almost surely, 2^51008139 is an apocalyptic number.

51008139 is a deficient number, since it is larger than the sum of its proper divisors (41249845).

51008139 is a wasteful number, since it uses less digits than its factorization.

51008139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1108 (or 1105 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 51008139 is about 7141.9982497898. The cubic root of 51008139 is about 370.8627032694.

The spelling of 51008139 in words is "fifty-one million, eight thousand, one hundred thirty-nine".