51031320425 has 24 divisors (see below), whose sum is σ = 64679526912. Its totient is φ = 39922848000.

The previous prime is 51031320377. The next prime is 51031320427. The reversal of 51031320425 is 52402313015.

It is a happy number.

It is not a de Polignac number, because 51031320425 - 2⁸ = 51031320169 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 51031320394 and 51031320403.

It is not an unprimeable number, because it can be changed into a prime (51031320427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1428785 + ... + 1464065.

It is an arithmetic number, because the mean of its divisors is an integer number (2694980288).

Almost surely, 2^51031320425 is an apocalyptic number.

It is an amenable number.

51031320425 is a deficient number, since it is larger than the sum of its proper divisors (13648206487).

51031320425 is a wasteful number, since it uses less digits than its factorization.

51031320425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36569 (or 36564 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The spelling of 51031320425 in words is "fifty-one billion, thirty-one million, three hundred twenty thousand, four hundred twenty-five".