51176287021 has 2 divisors, whose sum is σ = 51176287022. Its totient is φ = 51176287020.

The previous prime is 51176287003. The next prime is 51176287031. The reversal of 51176287021 is 12078267115.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39845748996 + 11330538025 = 199614^2 + 106445^2 .

It is a cyclic number.

It is not a de Polignac number, because 51176287021 - 2⁹ = 51176286509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51176287031) 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 as a sum of consecutive naturals, namely, 25588143510 + 25588143511.

It is an arithmetic number, because the mean of its divisors is an integer number (25588143511).

Almost surely, 2^51176287021 is an apocalyptic number.

It is an amenable number.

51176287021 is a deficient number, since it is larger than the sum of its proper divisors (1).

51176287021 is an equidigital number, since it uses as much as digits as its factorization.

51176287021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47040, while the sum is 40.

The spelling of 51176287021 in words is "fifty-one billion, one hundred seventy-six million, two hundred eighty-seven thousand, twenty-one".