51520537447 has 2 divisors, whose sum is σ = 51520537448. Its totient is φ = 51520537446.

The previous prime is 51520537403. The next prime is 51520537463. The reversal of 51520537447 is 74473502515.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51520537447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51520537547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25760268723 + 25760268724.

It is an arithmetic number, because the mean of its divisors is an integer number (25760268724).

Almost surely, 2^51520537447 is an apocalyptic number.

51520537447 is a deficient number, since it is larger than the sum of its proper divisors (1).

51520537447 is an equidigital number, since it uses as much as digits as its factorization.

51520537447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 588000, while the sum is 43.

The spelling of 51520537447 in words is "fifty-one billion, five hundred twenty million, five hundred thirty-seven thousand, four hundred forty-seven".