51737536021 has 2 divisors, whose sum is σ = 51737536022. Its totient is φ = 51737536020.

The previous prime is 51737536003. The next prime is 51737536031. The reversal of 51737536021 is 12063573715.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50008140625 + 1729395396 = 223625^2 + 41586^2 .

It is a cyclic number.

It is not a de Polignac number, because 51737536021 - 2⁷ = 51737535893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51737536031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25868768010 + 25868768011.

It is an arithmetic number, because the mean of its divisors is an integer number (25868768011).

Almost surely, 2^51737536021 is an apocalyptic number.

It is an amenable number.

51737536021 is a deficient number, since it is larger than the sum of its proper divisors (1).

51737536021 is an equidigital number, since it uses as much as digits as its factorization.

51737536021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 132300, while the sum is 40.

The spelling of 51737536021 in words is "fifty-one billion, seven hundred thirty-seven million, five hundred thirty-six thousand, twenty-one".