51010639 has 2 divisors, whose sum is σ = 51010640. Its totient is φ = 51010638.

The previous prime is 51010627. The next prime is 51010643. The reversal of 51010639 is 93601015.

51010639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51010639 - 2⁷ = 51010511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51010699) 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 as a sum of consecutive naturals, namely, 25505319 + 25505320.

It is an arithmetic number, because the mean of its divisors is an integer number (25505320).

Almost surely, 2^51010639 is an apocalyptic number.

51010639 is a deficient number, since it is larger than the sum of its proper divisors (1).

51010639 is an equidigital number, since it uses as much as digits as its factorization.

51010639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 25.

The square root of 51010639 is about 7142.1732686907. The cubic root of 51010639 is about 370.8687620516.

The spelling of 51010639 in words is "fifty-one million, ten thousand, six hundred thirty-nine".