51338539 has 4 divisors (see below), whose sum is σ = 58672624. Its totient is φ = 44004456.

The previous prime is 51338537. The next prime is 51338561. The reversal of 51338539 is 93583315.

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 51338539 - 2¹ = 51338537 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51338498 and 51338507.

It is not an unprimeable number, because it can be changed into a prime (51338533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3667032 + ... + 3667045.

It is an arithmetic number, because the mean of its divisors is an integer number (14668156).

Almost surely, 2^51338539 is an apocalyptic number.

51338539 is a deficient number, since it is larger than the sum of its proper divisors (7334085).

51338539 is an equidigital number, since it uses as much as digits as its factorization.

51338539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7334084.

The product of its digits is 48600, while the sum is 37.

The square root of 51338539 is about 7165.0916951565. The cubic root of 51338539 is about 371.6617222916.

The spelling of 51338539 in words is "fifty-one million, three hundred thirty-eight thousand, five hundred thirty-nine".