51010139 has 4 divisors (see below), whose sum is σ = 51090360. Its totient is φ = 50929920.

The previous prime is 51010129. The next prime is 51010171. The reversal of 51010139 is 93101015.

51010139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51010139 - 2¹⁶ = 50944603 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51010139.

It is not an unprimeable number, because it can be changed into a prime (51010129) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 39149 + ... + 40430.

It is an arithmetic number, because the mean of its divisors is an integer number (12772590).

Almost surely, 2^51010139 is an apocalyptic number.

51010139 is a deficient number, since it is larger than the sum of its proper divisors (80221).

51010139 is an equidigital number, since it uses as much as digits as its factorization.

51010139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80220.

The product of its (nonzero) digits is 135, while the sum is 20.

The square root of 51010139 is about 7142.1382652536. The cubic root of 51010139 is about 370.8675503110.

The spelling of 51010139 in words is "fifty-one million, ten thousand, one hundred thirty-nine".