51389539 has 2 divisors, whose sum is σ = 51389540. Its totient is φ = 51389538.

The previous prime is 51389497. The next prime is 51389549. The reversal of 51389539 is 93598315.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51389539 - 2⁹ = 51389027 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51389495 and 51389504.

It is not a weakly prime, because it can be changed into another prime (51389549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25694769 + 25694770.

It is an arithmetic number, because the mean of its divisors is an integer number (25694770).

Almost surely, 2^51389539 is an apocalyptic number.

51389539 is a deficient number, since it is larger than the sum of its proper divisors (1).

51389539 is an equidigital number, since it uses as much as digits as its factorization.

51389539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145800, while the sum is 43.

The square root of 51389539 is about 7168.6497333877. The cubic root of 51389539 is about 371.7847518589.

The spelling of 51389539 in words is "fifty-one million, three hundred eighty-nine thousand, five hundred thirty-nine".