51264139 has 4 divisors (see below), whose sum is σ = 51286320. Its totient is φ = 51241960.

The previous prime is 51264133. The next prime is 51264151. The reversal of 51264139 is 93146215.

51264139 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 51264139 - 2⁵ = 51264107 is a prime.

It is a super-2 number, since 2×51264139² = 5256023894822642, which contains 22 as substring.

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 51264139.

It is not an unprimeable number, because it can be changed into a prime (51264133) 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, 7159 + ... + 12400.

It is an arithmetic number, because the mean of its divisors is an integer number (12821580).

Almost surely, 2^51264139 is an apocalyptic number.

51264139 is a deficient number, since it is larger than the sum of its proper divisors (22181).

51264139 is a wasteful number, since it uses less digits than its factorization.

51264139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22180.

The product of its digits is 6480, while the sum is 31.

The square root of 51264139 is about 7159.8979741334. The cubic root of 51264139 is about 371.4820976467.

The spelling of 51264139 in words is "fifty-one million, two hundred sixty-four thousand, one hundred thirty-nine".