51031320427 has 2 divisors, whose sum is σ = 51031320428. Its totient is φ = 51031320426.

The previous prime is 51031320377. The next prime is 51031320533. The reversal of 51031320427 is 72402313015.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51031320427 - 2²³ = 51022931819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51031320395 and 51031320404.

It is not a weakly prime, because it can be changed into another prime (51031324427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25515660213 + 25515660214.

It is an arithmetic number, because the mean of its divisors is an integer number (25515660214).

Almost surely, 2^51031320427 is an apocalyptic number.

51031320427 is a deficient number, since it is larger than the sum of its proper divisors (1).

51031320427 is an equidigital number, since it uses as much as digits as its factorization.

51031320427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5040, while the sum is 28.

The spelling of 51031320427 in words is "fifty-one billion, thirty-one million, three hundred twenty thousand, four hundred twenty-seven".